chore(linkedin-studio): release v4.0.0 — counts, three-doc, CHANGELOG (clears [skip-docs] debt)

Step 21 (remediation Wave 4 / S6, SOLO): finalize the audit-remediation as
v4.0.0. Version 3.1.0 -> 4.0.0 across all current-version declarations; counts
reconciled to the ls-derived source of truth (19 agents / 27 commands / 6 skills
/ 9 hooks / 25 reference docs / 16 newsletter phases — Step 20 confirmed NO
TRIM); three-doc sync (plugin README + plugin CLAUDE.md + root README) clears the
[skip-docs] debt accumulated across Wave 1-4; CHANGELOG v4.0.0 entry summarizing
Steps 1-20.

Scope additions beyond the plan's literal Files list, all version-sync or
[skip-docs]-debt in nature (flagged, not feature creep):
- ../../CLAUDE.md (root marketplace): linkedin-studio entry v3.1.0 -> v4.0.0
  (the version-sync invariant mandates updating every version reference; leaving
  it stale is a real inconsistency).
- scripts/test-runner.sh: added the version-consistency grep the file's own
  Step-1 comment promised ("added in Step 21") — plugin.json version must match
  the README badge, the CLAUDE.md header, and the CHANGELOG top entry — and
  folded the Wave 2 lint gap (plugin.json now covered by the stat-consistency
  scan). 66/0/0, exit 0.
- plugin README: added the missing /linkedin:firsthour command row (Step 16
  [skip-docs] debt) and the 25th reference doc (longform-quality-rules.md) to
  the knowledge-base table; fixed body counts ("All 26 commands" -> 27, "24
  reference documents" -> 25); badges + intro 26 -> 27 commands, 24 -> 25 refs.
- root README + marketplace.json: dropped the unpublishable model brand/date
  ("360Brew" / "January 2026") the algorithm-signal reconciliation already
  removed everywhere inside the plugin.

Surviving "3.1.0" strings are intentional history, not stale declarations: the
README version-history table row, the "vX added Y" attributions in
plugin.json/CLAUDE.md, and the headless-review reload caveat are all
changelog-genre. Every current-version declaration (plugin.json version, README
badge, CLAUDE.md header, root README marker, marketplace.json) reads 4.0.0.

The major bump reflects the remediation's scope plus the reinstall/reload the
newly-wired agents need to register, and consolidates — does not repeat — the
v3.0.0 identity break; it is not a fresh breaking API change (locked operator
decision).

Pre-existing and out of scope (flagged, untouched): a duplicate /linkedin:setup
row in the README command tables.

Verify: bash scripts/test-runner.sh exit 0 (66/0/0); plugin.json + marketplace.json
parse; counts consistent README == CLAUDE.md == root README; stale-count sweep
clean. NO push — /trekreview (S7) is the release gate.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

plugins/linkedin-studio/.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "linkedin-studio",
-  "version": "3.1.0",
-  "description": "LinkedIn Studio — full-spectrum LinkedIn content engine: feed posts, carousels, video scripts, and long-form newsletter editions, with the 2026 relevance-ranking model baked in. v3.1.0 (Endring 9) adds a cold adversarial review package to `/linkedin:newsletter` — Step 6.5 + the standalone `/linkedin:headless-review` command run three new headless archetypes (content-reviewer, language-reviewer, fact-reviewer) plus the persona reviewer with NO drafting-session context — a `/linkedin:pivot` command that re-opens cleared gates after a late change, and per-artifact personas (one or more readers configurable per edition). v3.0.0 renamed the plugin (was `linkedin-thought-leadership`): slug, agent namespace, and state-file path are `linkedin-studio`; the `/linkedin:*` commands are unchanged.",
+  "version": "4.0.0",
+  "description": "LinkedIn Studio — full-spectrum LinkedIn content engine: feed posts, carousels, video scripts, and long-form newsletter editions, with the 2026 relevance-ranking model baked in. v4.0.0 is an audit-remediation release (Voyage Phase 0–3): every user-facing claim is made honest or removed, all 11 previously-orphaned agents are wired (→ 19 agents), a `/linkedin:firsthour` post-publish command is added (→ 27 commands), the algorithm-signal claims are reconciled to one sourced statement (no unpublishable model name or date), short-form de-AI and video quality gates are added, and the structure lint is rebuilt to guard the real layout plus version/count/stat consistency. Breaking: the newly-wired agents register only on reinstall/reload, and this consolidates the v3.0.0 identity break (slug, agent namespace `linkedin-studio:<agent>`, state-file path `~/.claude/linkedin-studio.local.md`). v3.1.0 added the cold adversarial review package (`/linkedin:headless-review` + Step 6.5 + `/linkedin:pivot` + per-artifact personas); the `/linkedin:*` commands are unchanged.",
   "author": {
     "name": "Kjell Tore Guttormsen"
   },