ci(rule-enforcement): strip markdown emphasis before deliverables grep (ADR-0136)

[lusoris]

Summary

The Deep-Dive Deliverables Checklist (ADR-0108) job greps the PR body for each label (AGENTS.md invariant note, etc.) as a literal string inside - \[x\].*${item}. The PR template itself wraps some of those labels in backticks ( - [ ] **`AGENTS.md` invariant note** —), so a PR that ticks the checklist verbatim from the template produces a body line where .md and invariant note are separated by a backtick + space — and the grep rejects it.

PR #72 tripped this exact failure on first CI. "Edit the PR body and delete backticks" is the wrong layer to fix it.

Fix

One line: strip `, *, _ from the body once before writing to the grep target, in both the parse step and the diff-verification step:

- printf '%s' "${PR_BODY:-}" > /tmp/pr_body.md
+ printf '%s' "${PR_BODY:-}" | tr -d '`*_' > /tmp/pr_body.md

None of the six deliverable labels contain any of those three characters internally, so the normalisation is loss-free for the matching path. Case-insensitivity was already enabled.

Type

• ci — tooling / infra

Checklist

• Commits follow Conventional Commits.
• No C / Python changes — make lint N/A.
• No unit tests affected (workflow-only change).

Deep-dive deliverables (ADR-0108)

• no digest needed: trivial — single-file workflow fix; decision rationale lives in ADR-0136.
• Decision matrix — ADR-0136 ## Alternatives considered weighs four options (fix bodies, reword template, normalise body via tr, rewrite parser).
• no rebase-sensitive invariants — .github/workflows/rule-enforcement.yml is fork-only CI, /sync-upstream policy is fork-wins for .github/.
• Reproducer / smoke-test command — pasted below under "Reproducer".
• no CHANGELOG entry: CI-only — workflow semantics do not surface to library users.
• no rebase impact: CI-only — see rebase-sensitive line above.

Reproducer

# Simulate the check locally against a conforming template-style body.
cat > /tmp/body.md <<'MD'
- [x] **`AGENTS.md` invariant note** — added to libvmaf/src/cuda/AGENTS.md
MD

# Before the fix: literal grep mismatches because of the backtick+space.
grep -qiE -- "- \[x\].*AGENTS.md invariant note" /tmp/body.md && echo OK || echo FAIL

# After the fix: tr-d normalises first, then the same grep passes.
tr -d '\`*_' < /tmp/body.md \
  | grep -qiE -- "- \[x\].*AGENTS.md invariant note" && echo OK || echo FAIL
# Expected before: FAIL. Expected after: OK.

Cross-check: this PR's own body exercises the checker — every tick and opt-out here should green the job.

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