feat(skills): reviewing-adversarially, one stance for every reviewer

A new skill, voyage:reviewing-adversarially (contract S4): no praise, no
finding without a source (file:line or a quoted line), no downgrade without
a reason, summary-only said and not judged, a Declined to Judge list, claims
checked against the diff rather than the report, axes kept separate.

Red baseline first: six review runs by helpers without the skill (two
invented fixtures) had no separate Declined to Judge list in 6 of 6, an
unsourced finding in 6 of 6, praise in 2 of 6 and a verdict on something
unmeasured in 4 of 6. With the skill: 6 of 6, 0, 0 and 0.

- brief-conformance-reviewer, code-correctness-reviewer, review-coordinator
  and scope-guardian preload it through skills:; the 21-line "Interaction
  Awareness - MANDATORY OVERRIDE" block copied into three of them is gone.
  Each agent keeps its own role.
- The two reviewers and scope-guardian end with their own Declined to Judge
  list; /trekreview names the skill at spawn and passes the reviewers'
  lines to the coordinator, which copies them into review.md as prose
  (the JSON declined_to_judge array and the verdict are unchanged).
- Eval cases 3 / 2 / 1; pins in tests/lib/skills-review-prose-pins.test.mjs.
- tests/fixtures/jsonl-schemas.md: the trekreview-stats line_ref moves with
  Phase 8 (636-686).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

evals/skill-reviewing-adversarially-quiet-2/graders/skill-quiet.md

@@ -0,0 +1,8 @@
+---
+type: tool_used
+tool: Skill
+input_match: '"skill"\s*:\s*"(?:voyage:)?reviewing-adversarially"'
+min: 0
+max: 0
+arm: both
+---

evals/skill-reviewing-adversarially-quiet-2/prompt.md

@@ -0,0 +1,10 @@
+---
+description: "Routing case: the reviewing-adversarially skill must stay quiet on a request to tidy the wording of a text; that is editing, not a verdict. /trekresearch produces research briefs and is named as the owner."
+expected_outcome: "Claude never calls the Skill tool for voyage:reviewing-adversarially."
+tags: [skill-no-trigger, skill=reviewing-adversarially, owner=trekresearch, from=order-7d-negatives]
+runs: 3
+max_turns: 4
+allowed_tools: [Read, Glob, Grep, Skill]
+---
+
+Smooth the wording of my research brief's summary and fix the typos. Do not change what it says.