merge: main (7a skills workshop, 9 rettepakke) into wave2-skills-research

Conflict: CLAUDE.md command table. Kept both sides: this branch's
/trekresearch row (the external agents preload researching-sources) and
main's /trekplan row (open minors listed for the operator).

researching-sources adapted to contract S1, now that 7a's form check and
routing test run over it:
- SKILL.md takes the fixed headings (Overview, When to use, Process, Red
  flags, Enforced by, Credits); the five rules and the confidence scale move
  under Process unchanged; Red flags lists the thoughts the baseline runs
  showed; "text only" becomes "prose only" as the form check reads it.
- The description adds "official" documentation and "looking up online what
  an error message means or what causes it": the error-lookup case ranked
  #3 behind debugging. That prompt also said "our tests fail", which is
  debugging's job; it now asks only what the error means and where that is
  documented. No threshold changed.
- Eval cases carry the routing tags (skill-trigger / skill-no-trigger /
  skill-effect, skill=, owner= task-finder and trekplan, from=), 7a's
  Skill grader pattern, arm: both on the no-trigger graders, and the
  judge-model line on the effect case.
- The `## Skills` row in README and CLAUDE.md.
- tests/lib/skills-research-prose-pins.test.mjs drops its two form pins
  (skill-lint is the authority now): 14 -> 12.

npm test on the merged tree: 2055 = 2053 pass / 0 fail / 2 skipped
(main 2043 + 12).

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

evals/skill-researching-sources-miss-plan/graders/skill-not-loaded.md

@@ -1,7 +1,8 @@
 ---
 type: tool_used
 tool: Skill
-input_match: "researching-sources"
+input_match: '"skill"\s*:\s*"(?:voyage:)?researching-sources"'
 min: 0
 max: 0
+arm: both
 ---

evals/skill-researching-sources-miss-plan/prompt.md

@@ -1,7 +1,7 @@
 ---
 description: "SKILL ROUTING, should NOT trigger. Asking for an implementation plan belongs to /trekplan, not to the research source rules."
 expected_outcome: "No Skill call for researching-sources."
-tags: [skills, researching-sources]
+tags: [skill-no-trigger, skill=researching-sources, owner=trekplan, from=order-7b-trigger-set]
 runs: 1
 max_turns: 8
 timeout_seconds: 300