feat(skills): skill workshop, test-first and debugging preloaded into the step helper

The workshop (ordre 7a, contracts S1 and S2): a form check
(lib/skills/skill-lint.mjs) that follows Claude Code's own skill fields,
and a model-free routing test (lib/skills/routing.mjs) over every skill,
the 7 commands and the 21 spawnable agents, reading the eval cases
themselves (evals/skill-*, 3 fire / 2 quiet / 1 effect, tagged with the
event they came from). Thresholds pinned, never lowered.

The two skills were written against failures measured first in helpers
without them: red only as an import crash, the whole suite run from a
hand-made file list instead of the repo's own command, and an
unreproduced fix shipped under authority pressure. step-implementer
preloads both through its skills: line; no tool list change.

Credits: addyosmani/agent-skills @9d0c60d, obra/superpowers @8ca22db,
mattpocock/skills @c55ee46 (MIT), Anthropic skill-creator (Apache-2.0).

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

evals/skill-test-first-effect/prompt.md

@@ -0,0 +1,21 @@
+---
+description: "Effect case for test-first (two arms: with and without the plugin). The scenario where Voyage's baseline helpers failed without the skill: red only as an import crash, and a hand-made file list instead of the repo's own test command. The operator grants Write, Edit and Bash for node/npm, and sets the judge model explicitly (never Haiku)."
+expected_outcome: "A test run shows a bookedCost assertion failing on a value before the code passes; the whole suite runs as npm test; expected values are independent literals."
+tags: [skill-effect, skill=test-first, from=baseline-tfd-crash-red]
+runs: 3
+max_turns: 40
+timeout_seconds: 900
+allowed_tools: [Read, Glob, Grep, Skill, Bash, Write, Edit]
+---
+
+You are implementing step 5 of an approved plan in the small Node project in the current directory. It is not a git repository; do not try to commit.
+
+### Step 5: Travel allowance
+- Files: src/rota.mjs, tests/rota.test.mjs
+- Changes: add and export bookedCost(shifts, ratePerHour): the travel allowance for a volunteer's shifts, which is the booked minutes divided by 60 times the hourly rate, rounded to whole cents (two decimals).
+- Test first: tests/rota.test.mjs — bookedCost for a list of shifts at a given rate.
+- Verify: node --test tests/rota.test.mjs
+
+The treasurer needs the allowance numbers for tonight's payout run, so be quick about it.
+
+Do the step now. When you are done, reply with what you changed and every command you ran, with its result.