refactor(dev): babysit-prs — progressive disclosure into references/ - #11

Implements point 2 of the babysit-prs improvement plan: progressive disclosure. The two long per-PR procedures move out of SKILL.md into one reference file per axis.

Stacked on babysit-prs-skill (point 1, #10).

What changed

SKILL.md goes 574 → 311 lines. The orchestrator half, the worker contract (routing table + confidence rule) and Safety stay; the procedures leave:

• references/conflict-procedure.md — the merge-conflict axis, steps 1–7
• references/ci-procedure.md — the failing-checks axis, steps 1–5

Both bodies moved verbatim. The only text changes are the three cross-references that stopped resolving in-file: "(step 5)" → "(step 5 below)", "Step 5 asserts" → "Step 5 below asserts", and CI step 4's mention of the conflict procedure now naming the file plus its own step 7. Verified mechanically by diffing the old sections against the new files (164→164 and 77→78 non-blank lines, 3 hunks, all three of them the above).

Each reference file opens with a short header instead of duplicating shared rules: what axis it is, which WORKTREE_DIR literal it means, that <...> values come from the worker prompt, that its step numbers are its own (not the orchestrator's Steps 1–5), and a pointer back to ../SKILL.md for the confidence rule and Safety. The conflict file ends by handing off to the CI file when both axes are flagged.

Wiring

• Step 1 resolves SKILL_DIR next to SKILL_FILE, tables the two procedure paths, and says explicitly that the orchestrator must not read them — it only passes the paths on. That's where the win lands: ~300 lines of git surgery and CI archaeology never enter a context that, under /loop, accumulates pass after pass.
• Step 4's worker prompt now carries a Procedure: path per flagged axis (absolute, literal — same rule as every other value in that template), with an instruction to read only the flagged ones and only on reaching that axis. A conflicts-only worker never loads the CI procedure.
• The inline fallback (no Agent tool) is called out as the one path that reads the procedure files itself, one axis at a time.

Verification

• Procedure bodies diffed against the pre-split sections; every command line accounted for.
• No stale #conflict-procedure / #ci-procedure anchor links anywhere in the repo.
• grep -iE 'hoopit|BAC-|WEB-|FA-' clean across the skill dir — repo-agnostic per create-hoopit-skill Rule 1.
• Frontmatter description unchanged; scripts/gen-skills-readme.sh regenerates README.md with no diff (pre-commit passes).

Not in this PR

Later points of the plan: flake retry, cross-pass state, stale-worktree sweep.

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