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docs(linkedin-studio): second-brain SB-S0 brief + plan (review-hardened)

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Light-Voyage process artifacts for the first second-brain slice (SB-S0):

- brief.md — task brief, revised after adversarial brief-review (B1 fold-source
  premise, B2 pathguard claim [later verified: STATE was right, reviewer wrong],
  M1 floors-as->=, M2 scaffold trigger, M3 grammar contract, M4 runtime-only).
- plan-sb-s0.md — SB-S0 implementation plan, revised after adversarial
  plan-review (plan-critic + scope-guardian, both code-verified):
  B1 test convention -> real TS idiom (tests/*.test.ts via tsx, .js specifiers);
  M2 profile format -> defined line-grammar (repo has no YAML parser, no dep);
  M3 data-root -> inline per-package resolver (repo idiom, not a new seam);
  M4 fold extraction rule pinned against the actual user-profile template;
  + minors (gate-count rationale, npm-install-before-gate, provenance throws,
  stable-slug id, push-confirm).

scope-guardian: zero creep, zero MAJOR gap. plan-critic: B1+3 MAJOR, all folded.
Design phase, no code yet — awaiting operator go to build SB-S0 (TDD).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RigJBiRFNtFZKCz21qNbQ4
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Kjell Tore Guttormsen 2026-06-23 13:24:18 +02:00
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# Task Brief — Second Brain (compounding per-user knowledge engine)
> **Status:** revised after adversarial brief-review (light-Voyage step 2 → findings folded in). Architecture approved by operator 2026-06-23 (`architecture.md`).
> **Inputs:** `architecture.md` (approved design) · `research/{connector-egress,secondbrain-sota,silo-inventory}.md`.
> **Build target of this brief:** the arc objective + scope fence, and the **first slice SB-S0** in detail. SB-S1..S4 are scoped one-line; their detailed plans come later, one per slice.
> **Review delta (2026-06-23):** B1 fold-source rewritten (template-as-field-source + source-absent no-op); B2 pathguard claim corrected (discrepancy flagged); M1 floors as `≥`; M2 scaffold trigger decided (idempotent CLI/TS subcommand, session-start wiring deferred to SB-S2); M3 profile grammar contract pinned; M4 `brain/` is runtime-only (no committed seed); minors m1–m4 folded.
---
## 1. Objective
Turn the plugin's existing siloed per-user stores into **one compounding "second brain"**: a per-user knowledge engine that accumulates everything about a creator (posts, articles, newsletters, plans, ideas), keeps a two-layer profile that improves over time, and stays aligned to who the user *is now* — drift-resistant and collapse-resistant. It is **memory AND an operations centre**.
The engine is a **plugin capability** (domain-general, shareable). The user's data lives in the per-user data dir. The user's personal cockpit lives in Maskinrommet (out of scope here).
## 2. Background (why this shape)
- **Nothing to migrate** — M0 already routed the **data-root silos** (trends, specifics, analytics, drafts/queue, plans, voice, profile, scaffolds) through one tested seam (`getDataRoot`), all surviving reinstall. The **state file** (silo A) stays on its own resolver (`getStateFile()`, `~/.claude/linkedin-studio.local.md`) and is NOT under the seam (see §7). The task is **unify**, not move. (`silo-inventory.md`)
- **Plain-text + JSON + git, not a vector/graph DB** — Claude *is* the retrieval engine (reads files in-context); a heavyweight store adds infra + lock-in for no gain. (`secondbrain-sota.md` §B.1)
- **Ingest is manual-first as the contract** — only EU/EEA DMA portability gives automated *content* pull (no analytics); scraping is a ToS breach. Connector is an additive tributary, never a dependency. (`connector-egress.md`)
## 3. Confirmed decisions (not open for re-litigation in review)
1. **Boundary:** engine → plugin · user data → data dir · cockpit → Maskinrommet.
2. **Shape:** thin Markdown `brain/` hub (two-layer `profile.md` + episodic `journal/` + `operations.md` + `index.md` MOC) over the **existing typed tributaries** (voice-samples, specifics-bank, trends, analytics), fed by a provenance-tagged `ingest/` seam.
3. **Tributaries keep their own schema/dedupe/lifecycle** — do NOT force one schema across silos. Only the user-profile field-set folds into `brain/profile.md`.
4. **Invariants:** provenance-weighted learning (`published` only, never `ai-draft`); one canonical entity id + one provenance shape (`provenance ∈ {human, published, ai-draft}`); episodic/semantic split; evidence-threshold promotion; temporal-validity + freshness nudge; anti-sycophancy default; frozen-past-self anchor; zero required curation.
Review SHOULD challenge: feasibility, sequencing, hidden coupling, testability, scope leakage, missing risks. Review SHOULD NOT re-open the four decisions above (operator-approved) unless it finds they are internally contradictory or technically impossible.
## 4. Scope — the arc (slices)
| Slice | One-line scope |
|-------|----------------|
| **SB-S0 — Foundation** *(this brief)* | `brain/` scaffold + two-layer `profile.md` (fold in the user-profile field-set) + `index.md` + `operations.md` + `journal/`; entity-id + provenance shape as a small typed, tested module; `ingest/{inbox,published}` dirs + the manual-import **contract** (shape only). No loop, no ingest-processing logic, no connector. |
| SB-S1 — Ingest + gold signal | Manual import populates `ingest/published/` with `provenance=published`; wire profile/voice to learn from published-only. |
| SB-S2 — Evolution loop | Sleep-time consolidation: journal+published+tributary deltas → profile diff w/ evidence_count/provenance/timestamps; threshold promotion; contradiction reconciliation; brain-wide freshness nudge. **Owns the session-start wiring of the scaffold init.** |
| SB-S3 — Cross-silo graph + ops centre | Thread the id through tributaries (post↔specific↔trend↔analytics); flesh out `operations.md`; retire dead `content-history.md` + triple-post reconciliation. |
| SB-S4 *(optional, later)* | EU/EEA DMA portability API as auto-tributary into `ingest/inbox/`. |
## 5. SB-S0 in detail (the build target)
**Deliverables:**
1. **`brain/` scaffold initialiser — an idempotent CLI/TS subcommand** (the trends-store idiom: runtime-created under the data-dir seam, NOT a tracked repo seed). It creates `brain/{index.md,profile.md,operations.md}` + `brain/journal/` + `ingest/{inbox,published}/` under `getDataRoot(subdir)` (which already accepts arbitrary subdirs — no new seam function needed). **Idempotent + migration-safe** (running twice is a no-op; never clobbers existing content). **No per-session cost** — session-start *wiring* of this init is explicitly deferred to SB-S2; SB-S0 ships only the invokable subcommand.
2. **`brain/profile.md` — two-layer schema** with `§ Static` and `§ Dynamic` sections. **Pinned contract (fixed):** one fact = one parseable record carrying all six fields `value · first_seen · last_seen · evidence_count · provenance(human|published|ai-draft) · status(active|superseded)`, and `serialize ∘ parse = identity`. **Open to the plan:** only the surface serialization syntax (frontmatter vs a defined line grammar).
3. **Fold the user-profile field-set into `brain/profile.md` — lossless + idempotent, with a defined source-absent path.** Source of the field *structure* is `config/user-profile.template.md` (the only file that ships; `profile/user-profile.md` is `expected-absent`, migrate-data.mjs:36). Behaviour:
- **Source-absent (the common case):** scaffold an empty two-layer `profile.md` whose static layer contains every template field present-but-unfilled.
- **Runtime instance present** (`${data}/profile/user-profile.md` exists): fold its filled values into the static layer.
- Re-running never duplicates fields and never overwrites already-folded values.
4. **Entity-id + provenance module** — a small typed module (TS, matching the trends/specifics idiom) that mints one canonical entity id at creation and defines the single provenance shape (`{human|published|ai-draft}`). Pure functions, deterministic, unit-tested. **Not yet threaded through tributaries** (that's SB-S3) — SB-S0 only establishes the module + shape.
5. **`index.md` MOC + `operations.md` seeds (runtime-generated)** — minimal but real: `index.md` points to every tributary with a freshness placeholder; `operations.md` has the "who I am now" anchor section. Generated by the initialiser (D1), not committed to the repo tree.
6. **Tests** — unit tests for the module + the scaffold + the fold (incl. the source-absent path). No structure-lint count change expected (SB-S0 adds no `agents/`, `commands/`, `references/`, or `skills/` file); a version bump, if any, updates README/CHANGELOG badges only.
## 6. Success criteria (SB-S0 — testable)
- **SC1 (scaffold, runtime):** with `LINKEDIN_STUDIO_DATA` set to a temp dir, invoking the init subcommand creates `brain/{index,profile,operations}.md` + `brain/journal/` + `ingest/{inbox,published}/` **at the runtime data-path** (not the repo tree), through `getDataRoot`; invoking it twice is a no-op (idempotent, no clobber). Verified by a test that sets the env var, runs init twice, asserts existence + unchanged content.
- **SC2 (profile parse):** `brain/profile.md` parses into `§Static`/`§Dynamic`; a fact round-trips through the pinned grammar with all six fields intact (`serialize ∘ parse = identity`). Verified by a parse/serialize unit test.
- **SC3 (fold lossless + source-absent):** (a) **source-absent:** running the fold with no runtime user-profile yields a `profile.md` whose static layer lists every `config/user-profile.template.md` field; (b) **populated:** given a synthetic populated fixture, the fold carries every filled field into the static layer (diff shows none dropped); (c) re-running either case does not duplicate or overwrite. Verified by fixture-based diff tests.
- **SC4 (id/provenance module):** the module mints a deterministic id (same input → same id) and **rejects** a malformed provenance value (throws; only `{human,published,ai-draft}` accepted); ≥1 unit test per public function.
- **SC5 (no regression):** `scripts/test-runner.sh` is green (currently 89 passed / 0 failed / 0 warnings); each floored suite stays **≥ its floor** (trends ≥24, specifics ≥28, contract ≥33); all hook tests pass.
- **SC6 (seam, no-op):** SB-S0 adds **no new seam function** (`brain/`/`ingest/` use the existing `getDataRoot(subdir)`), so the twin-sync surface is unchanged. Asserted as a no-op; *if* a future slice adds a seam function, the existing twin-sync test (`hooks/scripts/__tests__/data-root.test.mjs`) must be extended.
## 7. Non-goals / scope fence (SB-S0 does NOT)
- **No evolution loop / consolidation** (SB-S2).
- **No ingest processing logic** — `ingest/` dirs + the documented manual-import contract only; no parser that reads inbox files yet (SB-S1).
- **No connector** — no LinkedIn API code (SB-S4).
- **No cross-silo threading** — the id module exists but is NOT yet woven into trends/specifics/analytics (SB-S3).
- **No session-start wiring** of the scaffold init (SB-S2 owns it) — SB-S0 ships only the invokable subcommand.
- **Do NOT touch tributary schemas** (voice/specifics/trends/analytics stores keep their current shape).
- **Do NOT reconcile the two-roots question** (state file at `~/.claude/linkedin-studio.local.md` stays a sibling on `getStateFile()`; not folded in SB-S0).
- **Do NOT retire `content-history.md` or reconcile the triple-recorded post** (SB-S3).
- **No GUI / no cockpit** (Maskinrommet, out of repo scope).
## 8. Research plan / knowledge status
- **Done:** the three threads (connector reality, second-brain SOTA, silo inventory) are complete and persisted. No further research is required to start SB-S0. (Brief-review confirmed both §8 open assumptions are correctly non-blocking.)
- **Open assumptions to test (flagged, not blocking SB-S0):**
- "Claude-as-retrieval-engine over plain files is sufficient (no vector DB)" — testable once the brain holds content (post-SB-S1). Marked assumption.
- Newsletter-edition coverage by the portability `ARTICLES` domain — only relevant to SB-S4; verify against a real export then.
## 9. Constraints / risks
- **TDD iron law:** no production code without a failing test first.
- **New code placement:** SB-S0's new code is a **TS module under `scripts/`** (the trends/specifics idiom) + a runtime scaffold + edits to existing files. It creates **no new `.mjs` under `hooks/scripts/`**, so the pathguard does not affect SB-S0. **Verified 2026-06-23 (code-checked; STATE.md line 39 CONFIRMED correct, brief-review B2 was WRONG):** the llm-security plugin guard `pre-write-pathguard.mjs` IS enabled (`~/.claude/settings.json:148`) and registered as a PreToolUse hook with `matcher:"Write"` (Write-only); its Category 6 regex `/[\\/]hooks[\\/]scripts[\\/].*\.mjs$/` matches any `…/hooks/scripts/*.mjs`, **including this repo**. ⇒ a NEW `.mjs` under `hooks/scripts/` **cannot be written with the Write tool**; **editing an EXISTING `.mjs` is fine** (matcher is Write-only). Relevant to SB-S2 (which touches hook code → create new hook `.mjs` via Bash-heredoc, or edit an existing file). SB-S0 stays entirely in `scripts/`, so it is unaffected.
- **Twin data-root implementations** must stay byte-compatible (`hooks/scripts/data-root.mjs` ⇄ `scripts/analytics/src/utils/storage.ts`); SB-S0 adds no new seam function so the twin contract is untouched (SC6).
- **Public repo (`open/` Forgejo):** confirm before push; push only in the allowed window; STATE.md stays gitignored.
- **Structure lint** counts `agents/`, `commands/`, `references/`, `skills/` + the version badge. SB-S0 adds none of these, so no count guard fires absent a version bump.
- **Node v25 test quirk:** `node --test <dir>` doesn't work — use glob `__tests__/*.test.mjs`; run TS tools from their own dir.
- **Risk — fold ambiguity:** the user-profile→profile.md fold is the one data-shaping step in SB-S0; if the grammar is under-specified it risks lossy or non-idempotent folding. Mitigate with fixture-based diff tests (SC3) covering both the source-absent and populated paths before wiring.
## 10. Definition of done (SB-S0)
SC1–SC6 all pass; SB-S0 deliverables 1–6 exist; non-goals untouched; committed (push per window); `architecture.md` slice status updated to "SB-S0 landed"; `CLAUDE.md`/README touched only if a version bump is taken.

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# Implementation Plan — SB-S0 (Foundation)
> **Status:** revised after adversarial plan-review (`plan-critic` + `scope-guardian`, both code-verified) → all findings folded in. Ready for operator approval.
> **Brief:** `brief.md` §5–§10. **Architecture:** `architecture.md`.
> **Scope:** SB-S0 only — the `brain/` scaffold, the two-layer `profile.md` + lossless user-profile fold, the entity-id/provenance module, the `ingest/` seam dirs. **No loop, no ingest logic, no connector, no cross-silo threading, no session-start wiring** (brief §7).
> **Review delta (2026-06-23):** B1 test convention → real TS idiom (`tests/*.test.ts` via tsx, `.js` specifiers); M2 profile format → **defined line-grammar (no YAML dep)**; M3 data-root → inline per-package resolver (repo idiom, not a new seam); M4 fold extraction rule pinned against the real template; m1 gate rationale corrected; m2 npm-install-before-gate; m3 provenance throws; m4 id keyed on stable slug; G1 push-confirm; C1 identity now whole-file.
---
## 1. What SB-S0 delivers (recap)
A new TS package `scripts/brain/` (an exact structural copy of `scripts/specifics-bank/`) exposing an idempotent `brain init` CLI that scaffolds the `brain/` + `ingest/` tree at the runtime data-path, a pinned two-layer `profile.md` **line-grammar** with parse/serialize round-trip, a lossless+idempotent user-profile fold (source-absent + populated), and a deterministic entity-id + provenance module. All unit-tested, TDD (failing test first). Gate stays green.
## 2. Package layout (`scripts/brain/`) — exact copy of `scripts/specifics-bank/` conventions
```
scripts/brain/
package.json # copy specifics-bank/package.json; "test": "node --import tsx --test tests/*.test.ts"; devDeps tsx + typescript ONLY (no yaml — see §3.3)
tsconfig.json # copied VERBATIM from scripts/specifics-bank/tsconfig.json (rootDir ./src, include src/**/*)
src/
types.ts # Provenance, FactStatus, ProfileFact, ProfileDoc, constants
id.ts # mintEntityId(), slugify(), normalizeProvenance()
profile.ts # parseProfile(), serializeProfile(), foldUserProfile()
dataRoot.ts # inline resolver (repo idiom — §3.5)
cli.ts # `brain init`
tests/ # NOTE: tests/*.test.ts, run via tsx; import source via .js specifiers (e.g. "../src/id.js")
id.test.ts
profile.test.ts
scaffold.test.ts
fold.test.ts
fixtures/
user-profile.populated.md # synthetic populated user-profile mirroring the template's extractable constructs (§3.4)
```
**B1 fix (verified):** all three sibling TS packages use `tests/*.test.ts` via `node --import tsx --test tests/*.test.ts` and import source through `.js` specifiers (`specifics-bank/package.json:8`, `specifics-bank/tests/bank.test.ts:15` `from "../src/bank.js"`). The `__tests__/*.test.mjs` idiom is the HOOKS convention (no tsx loader) and cannot import `.ts` source — NOT used here.
## 3. Module designs
### 3.1 `types.ts`
```ts
export type Provenance = 'human' | 'published' | 'ai-draft';
export type FactStatus = 'active' | 'superseded';
export interface ProfileFact {
id: string; // canonical entity id (id.ts), keyed on a stable slug
value: string; // single-line (no embedded newline)
first_seen: string; // YYYY-MM-DD
last_seen: string; // YYYY-MM-DD
evidence_count: number;
provenance: Provenance;
status: FactStatus;
}
export interface ProfileDoc { schemaVersion: 1; static: ProfileFact[]; dynamic: ProfileFact[]; }
export const PROVENANCE_VALUES = ['human','published','ai-draft'] as const;
```
### 3.2 `id.ts`
- `slugify(label: string): string` → lowercase, trim, non-alphanumeric → `-`, collapse repeats. Stable across value edits.
- `mintEntityId(seed: {kind: string; key: string}): string` → `sha256(`${kind}:${slugify(key)}`).slice(0,12)` (matches trends/specifics `sha256[:12]`; confirm the exact hash call against `scripts/specifics-bank/src/bank.ts` in step 1). Deterministic, pure.
- `normalizeProvenance(raw: string): Provenance` → trim+lowercase; return the match or **throw** on anything outside `PROVENANCE_VALUES`. (m3: throws — SC4 asserts `assert.throws`; "normalises" dropped.)
### 3.3 `profile.ts` — pinned line-grammar (M2 decision: NO YAML dep)
**Verified:** the repo has no YAML parser (`state-updater.mjs:43` `extractField` is per-field regex on single scalars; zero `yaml` dependency in-tree). Frontmatter-with-nested-arrays would force a new dep + an untested hand-rolled emitter. **Decision — a defined line-grammar that round-trips with the regex idiom and needs no dep:**
```
# Profile
schemaVersion: 1
## Static
- [<provenance>|<status>|<first_seen>|<last_seen>|<evidence_count>|<id>] <value>
## Dynamic
- [<provenance>|<status>|<first_seen>|<last_seen>|<evidence_count>|<id>] <value>
```
- The bracket holds six pipe-joined **constrained** tokens (two enums, two ISO dates, an int, a 12-hex id) — none can contain `]` or `|`. `<value>` is the rest of the line after `] ` (free single-line text; may contain `]`/`|`/quotes).
- `parseProfile(text)`: split into `## Static` / `## Dynamic` sections; each `- [...]` line parsed by
`^- \[(human|published|ai-draft)\|(active|superseded)\|(\d{4}-\d{2}-\d{2})\|(\d{4}-\d{2}-\d{2})\|(\d+)\|([0-9a-f]{12})\] (.*)$`.
`schemaVersion` read by the existing scalar-regex idiom.
- `serializeProfile(doc)`: deterministic token order → `- [...] value`, sections in fixed order.
- **`parseProfile(serializeProfile(doc)) === doc`** over the WHOLE file (C1 resolved: there is no derived/ignored body — the lines ARE the authoritative representation). SC2 tests this identity.
### 3.4 `profile.ts` — `foldUserProfile()` (M4: extraction rule pinned against the real template)
`config/user-profile.template.md` is heterogeneous (`config/user-profile.template.md:15-147`: bold-label scalars, a numbered expertise group, checkbox lists, non-labeled bullets, prose guidance). **Pinned extraction — exactly two productions:**
- **P1 (labeled scalar):** any line matching `^\s*(?:- )?\*\*(.+?):\*\*\s*(.*)$` → `label`=g1, `value`=g2 (the `[placeholder]` text; treated as *unfilled/empty* when it is a bracketed placeholder, literal otherwise). One `ProfileFact` per match. Covers Name/Role/Organization/Industry, the `- **Primary:**` etc. sub-labels, Signature Elements, Writing Quirks, Current LinkedIn Status.
- **P2 (expertise group):** under the `**Core Expertise Areas (...)**:` label, each `^\d+\.\s*(.*)$` line → one fact, label `expertise-area-N`.
- **Excluded (deferred, noted §8):** checkbox lines (`- [ ] …` — Tone, LinkedIn Goals, Research MCPs, Asset Utilization), non-labeled bullet lists (Content Style Mix), the Voice-Profile-Summary numbered `1. **[Quality N]:**` items, prose guidance blocks (Universal anti-patterns 95-104, Research-Tooling explainer), and headers.
```
foldUserProfile({ templateText, instanceText?, existing? }): ProfileDoc
```
1. Apply P1+P2 to `templateText` → the canonical field-set (id = `mintEntityId({kind:'profile-field', key: label})`, value empty, `provenance:'human'`, `evidence_count:0`, `status:'active'`, dates = run date). → `static[]`. (`dynamic[]` empty in S0.)
2. **Source-absent (common):** no `instanceText` → return that field-set with empty values.
3. **Populated:** `instanceText` present → re-run P1+P2 on it, copy filled values onto the matching id.
4. **Idempotent:** if `existing` passed → merge by `id`; never duplicate, never overwrite a non-empty value, bump `last_seen` only.
Pure; the CLI supplies the file texts. (m4: id keyed on `slugify(label)`, stable across value edits; label-text stability is a known S0 limit — §8.)
### 3.5 `dataRoot.ts` — inline resolver (M3: repo idiom, NOT a new seam)
**Verified:** no shared util; cross-package import not configured (`specifics-bank/tsconfig.json` rootDir `./src`, no path map/workspace); siblings each inline it (`trends/src/store.ts:180`, `specifics-bank/src/bank.ts:150`, plus `analytics/src/utils/storage.ts:54`). Match the idiom:
```ts
import { homedir } from 'node:os'; import { join } from 'node:path';
export const dataRoot = (sub: string) =>
join(process.env.LINKEDIN_STUDIO_DATA ?? join(homedir(), '.claude', 'linkedin-studio'), sub);
```
This is a **private package resolver, not an exported seam function** → SC6 (no new seam, twin-sync untouched) holds. True de-duplication of the now-4 copies is an explicit out-of-scope refactor.
### 3.6 `scaffold.ts` — `initBrain(rootSub?)` (D1, D5) + `cli.ts`
- Create idempotently (mkdir-recursive; **compare-then-skip**, never blind-write): `brain/journal/`, `ingest/inbox/`, `ingest/published/`; `brain/profile.md` (IF absent → `serializeProfile(foldUserProfile({templateText}))`), `brain/index.md` (IF absent → MOC seed: one line per tributary [voice-samples, specifics-bank, trends, analytics, ingest] with `freshness: —`), `brain/operations.md` (IF absent → `## Who I am now (anchor)` + empty `## Plans` / `## Ideas`).
- Returns `{created[], skipped[]}`. **No session-start wiring** (SB-S2). `cli.ts`: `brain init` → `initBrain()`, print report. Dispatch shape copied from `specifics-bank/src/cli.ts`.
## 4. Files created / edited
**Created:** `scripts/brain/{package.json,tsconfig.json}` · `scripts/brain/src/{types,id,profile,dataRoot,cli}.ts` · `scripts/brain/tests/{id,profile,scaffold,fold}.test.ts` · `scripts/brain/fixtures/user-profile.populated.md`.
**Edited (minimal):**
- `scripts/test-runner.sh` — add a `BRAIN_TESTS_FLOOR` block copied from the `TRENDS_TESTS_FLOOR` block (`scripts/test-runner.sh:681-694`): cd `scripts/brain`, run the suite, grep `ℹ tests N` (`grep -oE 'tests [0-9]+' | tail -1`), assert `≥ BRAIN_TESTS_FLOOR`, emit one `pass()` line. Bump Section 18's anti-erosion note (`:770`, `TOTAL_CHECKS >= 74` grows by 1).
- `docs/second-brain/architecture.md` — flip SB-S0 row to "landed" (DoD).
- (NO change to `data-root.mjs`/`storage.ts` — no seam function added, SC6.)
## 5. TDD test plan (failing-first) → success criteria
| Test (`tests/*.test.ts`) | Asserts | SC |
|---|---|---|
| `id.test.ts` | `mintEntityId` deterministic (same in→same id; diff→diff); `slugify` stable; `normalizeProvenance` returns the 3 values, `assert.throws` on others | SC4 |
| `profile.test.ts` | `parseProfile(serializeProfile(doc)) === doc` over the whole file incl. a value containing `]`/`|`/quotes; sections `## Static`/`## Dynamic` present | SC2 |
| `fold.test.ts` | (a) source-absent → field-set from template (P1+P2), values empty; (b) populated fixture → every filled field carried (diff none-dropped); (c) re-run → no dup, no overwrite | SC3 |
| `scaffold.test.ts` | `LINKEDIN_STUDIO_DATA`=tmp → init creates all dirs+files at runtime path; second init = no-op (skipped[] covers them, files byte-identical) | SC1 |
| (gate) `scripts/test-runner.sh` | green; trends ≥24, specifics ≥28, contract ≥33, **brain ≥ floor**; hooks pass | SC5 |
| (n/a) | no new seam fn; unchanged `data-root.test.mjs` twin-sync still passes | SC6 |
Each test written **before** its module (iron law): red → implement → green.
## 6. Step sequence
1. **Confirm idioms in code (verify-first):** read `scripts/specifics-bank/{package.json,tsconfig.json,src/bank.ts,tests/bank.test.ts}` → copy the package/test scaffolding + the exact sha256 call. `npm install` in `scripts/brain` so tsx is present (m2: the gate `warn`-skips a suite if `node_modules/.bin/tsx` is absent — "green" must not mean green-because-skipped).
2. `types.ts` (no logic).
3. TDD `id.ts` (`id.test.ts`). → SC4.
4. TDD `profile.ts` parse/serialize line-grammar (`profile.test.ts`). → SC2.
5. Write `fixtures/user-profile.populated.md` mirroring the P1+P2 constructs; TDD `foldUserProfile` (`fold.test.ts`, 3 cases). → SC3.
6. TDD `scaffold.ts` `initBrain` (`scaffold.test.ts`, temp-dir idempotency). → SC1.
7. `cli.ts` `brain init`; smoke-run against a temp `LINKEDIN_STUDIO_DATA`.
8. Wire `scripts/test-runner.sh` BRAIN floor (+ Section 18 note); run the FULL gate green. → SC5/SC6.
9. Flip `architecture.md` SB-S0 → landed. **Commit; confirm before push (PUBLIC `open/` Forgejo) and only inside the push window; STATE.md stays gitignored** (G1).
## 7. Scope fence (echo — SB-S0 does NOT)
No consolidation loop · no ingest file parsing · no LinkedIn API · no id threading into tributaries · no session-start wiring · no tributary-schema edits · no state-file/two-roots reconciliation · no `content-history.md` retirement · no GUI.
## 8. Known limits / deferred (honest)
- **Fold covers only P1 labeled-scalars + P2 expertise group.** Checkbox preference lists (tone, goals, MCPs, assets), non-labeled bullets, and the Voice-Profile-Summary qualities are NOT folded in S0 — they are template *guidance/preferences*, foldable in a later slice when the profile schema grows. Stated so SC3a's field-set is finite + testable.
- **Profile-field id keyed on `slugify(label)`** — stable across value edits (fixes the raw-label non-idempotency). A *renamed template label* would still mint a new id; acceptable in S0 (template is fixed) — re-confirm if SB-S1+ lets users edit labels.
- **`parse∘serialize` identity holds for single-line values.** A value with an embedded newline is out of grammar; the fold never produces one (template/instance fields are single-line), but `addFact` paths in later slices must enforce it.
- **Gate "green" is honest only with deps installed** (m2) — fresh clone must `npm install scripts/brain` or the brain suite `warn`-skips.
## 9. Risks
- **Fold under-specification** → mitigated: P1+P2 pinned + `fold.test.ts` covers source-absent + populated + re-run before the CLI wires it.
- **Idempotency edge:** `initBrain` + fold merge must compare-then-skip (never blind-write); tested in `scaffold.test.ts` / `fold.test.ts` (c).
- **Gate mechanics (corrected, m1):** 89 is the gate's own `PASS+FAIL` tally; each suite contributes exactly ONE `pass()` line (not its internal `tests N`); the only total guard is the growable `TOTAL_CHECKS >= 74` floor (`:770`). Adding BRAIN raises that floor by 1 — no `==89` guard exists, so no regression flag. The risk is the warn-skip (m2), handled in step 1/8.