feat(linkedin): v2.1.0 — skeleton + spine-prose gates BEFORE prose in /linkedin:newsletter

Two new pipeline phases gate the spine before any prose is written:

- Step 2.5 — Skeleton + section pitch: writes <serie>/NN-skjelett.md with
  the five-line spine (premiss / problem / anbefaling / gevinst / vei
  videre) + one-line section pitches. Operator-gate (JA / REVIDER / NEI)
  AND parallel persona-skjelett-sweep must both return JA before the
  pipeline can advance.
- Step 3a — Spine prose: one paragraph per section against the gated
  skeleton, ~20-30% of final edition length. Operator-gate on whether the
  axis lands now that there is prose on it. Old Step 3 (Draft) split into
  3a (spine) and 3b (full expansion); 3b owns the multi-session
  draft-cursor logic.

Third persona-reviewer mode added: skjelett (alongside resonans + konverter).
Five spine axes scored HOLDER / TVILER / MANGLER, max 3 direction-only flags,
per-pitch section-pay-in check. Reads the skeleton + pitches only.

Pipeline grows from 11 to 13 phases; commands (24) and agents (14) counts
unchanged. Encodes the Maskinrommet writing-contract section A discipline
(premiss / problem / anbefaling / gevinst / vei videre) into the pipeline.

Empirically motivated by the Seres-serien Del 3 + Del 4 production:
a spine error caught at the skeleton stage costs 5-15 min, the same
error caught at Step 6 (resonance) costs 4-12 h, post-lock it costs a
day of cascading rework (delingstekst, hooks, carousel, doc refs).

Backward-compatible: existing editions stop at currentPhase: "research"
and now resume at Step 2.5 instead of Step 3 — an intended deterministic
improvement, never a contract break. Steps 1, 2, 4-10 bit-for-bit
unchanged. Renderers (build-html.mjs, build-linkedin.mjs) untouched.

New phase strings in edition-state.template.json _doc.phases:
- skeleton-pitch (between research and draft)
- spine-prose (between skeleton-pitch and draft)

Files changed (10):
- plugin.json: 2.0.0 -> 2.1.0
- CHANGELOG.md: new [2.1.0] entry
- CLAUDE.md (plugin + marketplace): pipeline 11->13 phases noted
- README.md (plugin + marketplace): What's New v2.1.0 + version row
- agents/persona-reviewer.md: third mode skjelett added; resonans + konverter unchanged
- commands/newsletter.md: Step 2.5 + 3a + 3b sections, resumption + pipeline tables
- config/edition-state.template.json: 11 -> 13 phases in _doc.phases
- references/longform-quality-rules.md: Rule 8 (Skjelett foer prosa)

Verification: 9/9 criteria PASS pre-commit. Phase strings consistent
across template + command + resumption table. Renderer files git-untouched.
All 11 original step headings preserved (Step 0/1/2/4-10).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

README.md

@@ -206,14 +206,15 @@ Key commands: `/architect`, `/architect:ros`, `/architect:security`, `/architect
 
 ---
 
-### [LinkedIn Thought Leadership](plugins/linkedin-thought-leadership/) `v2.0.0`
+### [LinkedIn Thought Leadership](plugins/linkedin-thought-leadership/) `v2.1.0`
 
 Build authentic LinkedIn authority through algorithmic understanding, strategic consistency, and AI-assisted content creation.
 
-v2.0.0 is a full-spectrum content engine: short-form feed posts AND long-form newsletter editions in one cohesive surface, with net-fewer commands and net-stronger pipeline. Updated for the January 2026 360Brew algorithm change, which validates your creator profile before distributing content.
+v2.1.0 adds a **skeleton gate BEFORE prose** to `/linkedin:newsletter` — two new pipeline phases (Step 2.5 skeleton + section pitch, Step 3a spine prose) each with their own operator-gate, plus a third `persona-reviewer` mode (`skjelett`) that judges the five-line spine before any prose is written. Empirically motivated by the Seres-serien Del 3 + Del 4 production: a spine error caught at the skeleton stage costs 5–15 minutes; the same error caught at the resonance stage (Step 6) costs 4–12 hours; post-lock it costs a day. The pipeline grows from 11 to 13 phases; command and agent counts (24, 14) are unchanged. v2.0.0's full-spectrum surface (short-form feed posts AND long-form newsletter editions) is preserved bit-for-bit. Updated for the January 2026 360Brew algorithm change, which validates your creator profile before distributing content.
 
-- **Long-form `/linkedin:newsletter` orchestrator** — multi-session pipeline (research → draft → fact-check sweep → persona sweep → lock → delivery → hook-gate) with maintained edition-state. Newsletter editions, essays, series articles
-- **Two new longform-quality gates** — `fact-checker` (Opus, verifies every claim against primary sources) and `persona-reviewer` (Opus, reader-persona resonance + hook conversion). Both run BEFORE lock
+- **Skeleton gate BEFORE prose (v2.1)** — `/linkedin:newsletter` Step 2.5 writes a five-line spine (premiss / problem / anbefaling / gevinst / vei videre) + one-line section pitches to `<serie>/NN-skjelett.md`. Operator-gate AND parallel persona-skjelett-sweep must both return JA before the pipeline can advance. Step 3a follows with spine prose (one paragraph per section) and its own operator-gate. Encodes the Maskinrommet writing-contract §A discipline into the pipeline.
+- **Long-form `/linkedin:newsletter` orchestrator** — multi-session 13-phase pipeline (research → **skeleton + persona-skjelett-sweep** → **spine prose** → full prose draft → fact-check sweep → persona sweep → lock → delivery → hook-gate) with maintained edition-state. Newsletter editions, essays, series articles
+- **Three longform-quality gate agent modes** — `fact-checker` (Opus, verifies every claim against primary sources) and `persona-reviewer` (Opus) with three modes: **`skjelett`** (Step 2.5, before prose), **`resonans`** (Step 6, before lock), **`konverter`** (Step 9, after lock)
 - **Render pipeline in-plugin** — `build-html.mjs`, `build-pdf.mjs`, `build-linkedin.mjs`, `build-carousel.mjs` with self-hosted Newsreader/Inter/JetBrains Mono under OFL-1.1
 - **Guided onboarding** — `/linkedin:onboarding` walks new users through profile → setup → first post in one flow
 - **360Brew profile optimization** — audit your profile against LinkedIn's creator validation criteria