docs(claude): replace em-dashes in CLAUDE.md

[cristim]

Closes #1295

Summary

CLAUDE.md contained 12 em-dashes (U+2014), which break the project rule against them. This PR replaces each one with whatever punctuation suits its sentence: a colon, commas, parentheses or a full stop. Two headings and a comment in the label-mirroring bash block are among the 12. The wording is otherwise unchanged, and no other file in the repo contains em-dashes.

Evidence

• grep -c "—" CLAUDE.md returns 0.
• markdownlint and the pre-commit hooks pass.
• A git diff --word-diff shows only the em-dash tokens and the punctuation next to them changed.
• Nothing links to the renamed headings: git grep finds no anchor references to them outside CLAUDE.md.
• An independent non-author reviewer (sonnet, high) did two passes and found no actionable findings at 1f3981b.

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between ee2b597 and 1f3981b.

📒 Files selected for processing: 1

• CLAUDE.md

• Autofix · Keep fixing CodeRabbit findings and required CI, and resolving merge conflicts

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[cristim]

Independent review verdict: CLEAN at 1f3981b

Reviewer: fresh Claude agent (Sonnet 5.5, high effort), not the author, briefed cold. Coordinator: claude-cc-reviewer.

Blocking findings: none.

What was checked:

• Punctuation only. All 12 changed lines (15, 70, 188, 194, 211, 249, 261, 301, 304, 341, 344) swap an em-dash for :, ,, parentheses or ;. The meaning is unchanged. The review gate, the MANDATORY rules and the planning loop are intact.
• Code blocks. The only edit inside a fenced block is a bash comment (# Guard against empty $LABELS: ...). No command changed, and the fences are intact.
• Em-dashes gone. grep -c $'—' CLAUDE.md at this head returns 0, which meets HYG: Replace 11 pre-existing em-dashes in CLAUDE.md (project rule) #1295.
• Renamed headings. Three headings changed. Nothing on origin/main links to their old anchors (#issue-assignment, #post-push-ci-watcher, #pr-labeling).

Local verification: non-runtime change. I checked the rendered markdown and the anchors as described above.

Gate:

• Labels are mirrored from HYG: Replace 11 pre-existing em-dashes in CLAUDE.md (project rule) #1295.
• CodeRabbit is rate limited and has posted no reviews or inline comments. Merge proceeds under CR waived: quota, adversarial review + local verification + green CI, and a retrospective CR review is needed once quota returns.
• Merge waits for CI to be green at this SHA.