feat(linkedin-studio): v3.1.0 — Endring 9 adversarial review-pakke + per-artefakt personas

Cold, adversarial review package for the long-form pipeline + configurable
per-edition personas. Motivated by Del 4 (Security Champions pivot): the
in-session editor + persona sweep shared the drafting session's framing-bias,
so the shipped version was never independently re-reviewed.

Headless package (9a/9b):
- New Step 6.5 (headless-review) in /linkedin:newsletter, after the persona
  sweep, before lock — the independence layer the in-session gates can't be.
- New standalone /linkedin:headless-review command (run in a fresh session for
  maximum isolation; reconstructs frozen draft + contract + personas from disk).
- 3 new Opus archetypes, each with a cardinal context-isolation block that
  refuses drafting-session framing as "context pollution":
  - content-reviewer (argument integrity C1–C5, ≤8 flags)
  - language-reviewer (Norwegian language L1–L5, ≤10 flags)
  - fact-reviewer (cold re-verification F1–F4, risk-sort + pivot-risk, WebSearch)
- Deliberate redundancy with fact-checker / editorial-reviewer documented so
  the pairs are never de-duplicated.

Pivot-reopen (9c):
- New /linkedin:pivot command: logs articles.NN.pivots[], resets currentPhase,
  un-locks, marks gates to re-run.
- Pivot-detection gate in Step 8 lock precondition (>20% word-count change or
  >2 new sections re-opens cleared gates). Del 4 v8→v11 worked example.

Per-artifact personas (new requirement):
- articles.NN.personas with resolution order (edition-state → series file →
  plugin library → interactive). One or more readers configurable per edition.

Schema/docs:
- edition-state.template.json: additive personas[], pivots[], headlessReview,
  headless-review phase (16 phases); personaSweep.resonance.wordCount baseline.
- 3 fasit fixtures + 3 structural lint tests (Del 4 worked cases).
- Counts: 24→26 commands, 16→19 agents, 15→16 newsletter phases.
- README + CLAUDE.md (plugin + root) + CHANGELOG synced.

Verification: 35 agent-fixture + 59 hook + 20 render tests green. Backward-
compatible (additive state); reload required before the 3 new agents resolve.

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": "3.0.0",
-  "description": "LinkedIn Studio — full-spectrum LinkedIn content engine: feed posts, carousels, video scripts, and long-form newsletter editions, with the January 2026 360Brew algorithm baked in. v3.0.0 renames the plugin (was `linkedin-thought-leadership`): the slug, agent namespace, and runtime state-file path are now `linkedin-studio` — the `/linkedin:*` commands are unchanged. Breaking: reinstall required and the state file moves to `~/.claude/linkedin-studio.local.md`.",
+  "version": "3.1.0",
+  "description": "LinkedIn Studio — full-spectrum LinkedIn content engine: feed posts, carousels, video scripts, and long-form newsletter editions, with the January 2026 360Brew algorithm 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.",
   "author": {
     "name": "Kjell Tore Guttormsen"
   },