chore(linkedin-studio): release v0.5.1 — SB-S1 ingest + gold signal

Bump version declarations 0.5.0 → 0.5.1 (plugin.json SSOT + README badge +
CLAUDE.md header + CHANGELOG [0.5.1] entry) for SB-S1. Flip the architecture
SB-S1 row to landed (+ top status). Additive minor: no command/agent/ref/skill
count change; voice-trainer's learning behaviour changes (published-only).
Gate 93/0/0. Polyrepo release (tag v0.5.1 + catalog ref bump) pending push window
+ operator confirm (public open/ remote).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RigJBiRFNtFZKCz21qNbQ4

docs/second-brain/architecture.md

@@ -1,6 +1,6 @@
 # Second Brain — Architecture Design
 
-> **Status:** architecture **approved by operator 2026-06-23**. **SB-S0 (Foundation) landed 2026-06-23** (`scripts/brain/`, 34 tests, gate-wired); S1–S4 remain design-phase.
+> **Status:** architecture **approved by operator 2026-06-23**. **SB-S0 (Foundation) + SB-S1 (Ingest + gold signal) landed 2026-06-23** (`scripts/brain/`, 63 tests, gate-wired; ingest CLI + published-only invariant); S2–S4 remain design-phase.
 > **Boundary (confirmed 2026-06-23):** the **engine** (store schema · evolution loop · ingest seam) → **the plugin** (domain-general, shareable); the **user's data** (posts · articles · newsletters · plans · ideas) → the **per-user data dir** (`${LINKEDIN_STUDIO_DATA:-$HOME/.claude/linkedin-studio}/`, survives reinstall); the **personal cockpit** (the operator's day-to-day operations centre) → **Maskinrommet** (a thin layer that reads/writes *through* the plugin's store, never a fork of the engine).
 > **Research inputs (three parallel threads, 2026-06-23):** `research/connector-egress.md` · `research/secondbrain-sota.md` · `research/silo-inventory.md`.
 
@@ -75,7 +75,7 @@ Run on a cadence (reuse the existing session-start staleness-nudge surface) as a
 | Slice | Content | Why this order |
 |-------|---------|----------------|
 | **SB-S0 — Foundation** ✅ *landed 2026-06-23* | `brain/` scaffold + two-layer `profile.md` (fold in `user-profile.md`) + `index.md` MOC + `operations.md` + `journal/`; entity-id + provenance shape as a small typed, tested module; `ingest/` dirs + manual-import contract. **No loop yet.** Shipped as `scripts/brain/` (TS, 34 tests, gate-wired BRAIN floor); fold = P1 labeled-scalars + P2 expertise (checkbox-prefs deferred, §8 of `plan-sb-s0.md`). | Smallest thing that stands up and is testable; locks the id/provenance spine everything hangs on |
-| **SB-S1 — Ingest + gold signal** | Manual import → `ingest/published/` with `provenance=published`; wire profile/voice to learn from published-only | The gold signal before the loop that consumes it |
+| **SB-S1 — Ingest + gold signal** ✅ *landed 2026-06-23* | Manual import → `ingest/published/` with `provenance=published` (CLI `brain ingest`); voice-trainer wired to learn from published-only, never `ai-draft`, gate-enforced. Shipped as `scripts/brain/src/ingest.ts` + `docs/second-brain/ingest-manual-import.md` (v0.5.1). **No profile.md mutation** (SB-S2). | The gold signal before the loop that consumes it |
 | **SB-S2 — Evolution loop** | Sleep-time consolidation (reuse session-start surface): journal+published+tributary deltas → profile **diff** w/ evidence_count/provenance/timestamps; threshold promotion; contradiction reconciliation; brain-wide freshness nudge | The compounding mechanism |
 | **SB-S3 — Cross-silo graph + ops centre** | Thread the id through tributaries (post↔specific↔trend↔analytics assemblable); flesh out `operations.md`; retire the dead `content-history.md` + triple-post reconciliation | Finally answers "which raw material performs?" |
 | *(later / optional)* **SB-S4** | EU/EEA DMA portability API as an auto-tributary into `ingest/inbox/` | Additive; never a dependency |