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>

plugins/linkedin-thought-leadership/CLAUDE.md

@@ -1,6 +1,6 @@
-# LinkedIn Thought Leadership Plugin (v2.0.0)
+# LinkedIn Thought Leadership Plugin (v2.1.0)
 
-Full-spectrum LinkedIn content engine — short-form feed posts, carousels, video scripts, and long-form newsletter editions — with the January 2026 360Brew algorithm baked in. v2.0.0 consolidated the surface (27 commands → 24, 16 agents → 14) while adding the long-form `/linkedin:newsletter` orchestrator + two longform-quality gate agents (`fact-checker`, `persona-reviewer`).
+Full-spectrum LinkedIn content engine — short-form feed posts, carousels, video scripts, and long-form newsletter editions — with the January 2026 360Brew algorithm baked in. v2.0.0 consolidated the surface (27 commands → 24, 16 agents → 14) while adding the long-form `/linkedin:newsletter` orchestrator + two longform-quality gate agents (`fact-checker`, `persona-reviewer`). **v2.1.0** adds two new gates BEFORE prose to `/linkedin:newsletter` — Step 2.5 (skeleton + section pitch with operator-gate + persona-skjelett-sweep) and Step 3a (spine prose with operator-gate) — plus a third `persona-reviewer` mode (`skjelett`), encoding the Maskinrommet writing-contract §A discipline (premiss / problem / anbefaling / gevinst / vei videre) into the pipeline itself. Pipeline grows from 11 to 13 phases; commands and agents unchanged in count (24, 14).
 
 ## Architecture
 
@@ -46,7 +46,7 @@ All content commands (post, quick, react, pipeline, first-post, video, multiplat
 | `/linkedin:post` | Full post creation (10-15 min) |
 | `/linkedin:quick` | 5-minute quick post (3-line formula) + 8 post-type templates |
 | `/linkedin:pipeline` | Full end-to-end content pipeline |
-| `/linkedin:newsletter` | Long-form orchestrator: newsletter edition / essay / series article — multi-session pipeline with fact-check + persona-sweep BEFORE lock |
+| `/linkedin:newsletter` | Long-form orchestrator: newsletter edition / essay / series article — multi-session 13-phase pipeline with **skeleton + spine-prose gates BEFORE prose (v2.1)** and fact-check + persona-sweep BEFORE lock |
 | `/linkedin:batch` | Create a full week of content |
 | `/linkedin:calendar` | View/manage post scheduling queue + publish action (mark scheduled posts as published) |
 | `/linkedin:carousel` | Structured multi-slide carousel generator |
@@ -80,7 +80,7 @@ All content commands (post, quick, react, pipeline, first-post, video, multiplat
 | `post-feedback-monitor` | Haiku | Lime | Post-publish 48h monitoring |
 | `video-scripter` | Sonnet | Violet | Video script creation with pacing |
 | `fact-checker` | Opus | Brown | Factual-claim verification against primary sources (longform) |
-| `persona-reviewer` | Opus | Olive | Reader-persona resonance + hook-conversion gate (longform) |
+| `persona-reviewer` | Opus | Olive | Reader-persona skeleton (v2.1, before prose) + resonance (before lock) + hook-conversion (after lock) gate (longform) |
 
 **Rule:** Always read `assets/voice-samples/` before generating content.