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/agents/__tests__/language-reviewer-fixture.test.mjs

@@ -0,0 +1,80 @@
+import { describe, test } from 'node:test';
+import assert from 'node:assert/strict';
+import { readFileSync } from 'node:fs';
+import { fileURLToPath } from 'node:url';
+
+// Lint-test for the language-reviewer fasit fixture.
+// Mirrors the structure-only discipline of editorial-reviewer-fixture.test.mjs,
+// persona-reviewer-fixture.test.mjs and fact-checker-fixture.test.mjs: this test
+// asserts the SHAPE of the fixture — the one judging axis (norsk-språkkvalitet),
+// all five checks (L1–L5), the three severities, the six Del 4 cases that form
+// the gold standard, the direction-not-copy boundary, and the cold-reader /
+// context-isolation principle. Whether the agent's live flags actually reproduce
+// the fasit directions is [GATE]/[OPERATØR], never self-certified here.
+
+const FIXTURE_PATH = fileURLToPath(
+  new URL('../fixtures/language-reviewer-cases.md', import.meta.url)
+);
+
+const fixture = readFileSync(FIXTURE_PATH, 'utf8');
+
+// The five checks of the one axis.
+const CHECKS = ['L1', 'L2', 'L3', 'L4', 'L5'];
+
+// The single axis name (Norwegian, as the agent and the writing contract use it).
+const AXIS = 'norsk-språkkvalitet';
+
+// The three-rung severity scale.
+const SEVERITIES = ['BLOCK', 'REWORK', 'NICE'];
+
+describe('language-reviewer fixture structure', () => {
+  test('names the judging axis (norsk-språkkvalitet)', () => {
+    assert.ok(
+      new RegExp(AXIS, 'i').test(fixture),
+      `fixture must name the axis "${AXIS}"`
+    );
+  });
+
+  test('documents all five checks (L1–L5)', () => {
+    for (const check of CHECKS) {
+      assert.ok(
+        fixture.includes(check),
+        `fixture must reference the check "${check}"`
+      );
+    }
+  });
+
+  test('defines the three-rung severity scale', () => {
+    for (const sev of SEVERITIES) {
+      assert.ok(
+        fixture.includes(sev),
+        `fixture must define the severity "${sev}"`
+      );
+    }
+  });
+
+  test('documents the six Del 4 cases', () => {
+    const cases = fixture.match(/^###\s+Case\s+\d+\b/gim) || [];
+    assert.equal(
+      cases.length,
+      6,
+      `fixture must document exactly 6 Del 4 cases (found ${cases.length})`
+    );
+  });
+
+  test('keeps the jury-judges-writer-writes boundary (direction, not copy)', () => {
+    assert.ok(
+      /direction, not rewritten copy/i.test(fixture),
+      'fixture must state the direction-not-copy boundary'
+    );
+  });
+
+  test('documents the cold-reader / context-isolation principle', () => {
+    assert.ok(
+      /cold/i.test(fixture) &&
+        /(context pollution|framing-bias)/i.test(fixture),
+      'fixture must document the cold-reader / context-isolation principle ' +
+        '(context pollution / framing-bias)'
+    );
+  });
+});