hygiene(#470 follow-up): fix MD032 naming + citation drift on patterns class

[AceHack]

Summary

Three Copilot post-merge findings on the freshly-landed Class H entry in `docs/pr-preservation/_patterns.md`:

• L139: heading said 'CommonMark MD032' — but MD032 is a markdownlint rule ID ('blanks-around-lists'), not a CommonMark identifier. Renamed to 'markdownlint MD032' (the trigger uses CommonMark-style list markers, but the lint rule itself is markdownlint's).
• L145: 'research: semantic-canonicalization-and-provenance-aware-retrieval spine (8th-ferry candidate #2) #280' citation pointed at a drain-log that doesn't exist. PR research: semantic-canonicalization-and-provenance-aware-retrieval spine (8th-ferry candidate #2) #280's same-class fix landed at write-time (commit `cce1df2`) before any per-PR drain log was filed for research: semantic-canonicalization-and-provenance-aware-retrieval spine (8th-ferry candidate #2) #280. Cite the fix-commit rather than a phantom drain-log so the observation is verifiable from the stated corpus.
• L170: 'Pre-commit-lint candidate' wording was vague. The repo already has `tools/hygiene/audit-md032-plus-linestart.sh` covering the `+`-at-line-start case. Update to point at the existing audit + state the new work clearly: extend to `- ` / `* ` or promote to pre-commit enforcement. Drop the 'Class A' label (this doc doesn't use Class A/B/C labels; that's BACKLOG backlog: P2 doc-lint suite from drain-log corpus patterns #465's roster); replace with the actual prior heading 'Inline-code-span line-wrap rendering bug'.

Test plan

• Three findings are pattern instances of classes the same doc names: citation drift (Class B-ish), terminology accuracy (markdownlint vs CommonMark surface-class confusion), and pre-existing-tool-not-cited (similar to Otto-114 forward-mirror compounding).
• Same shape as PR hygiene(_patterns.md): document Otto-250-canonical vs Otto-268-abbreviated shape divergence #467 self-correction (`_patterns.md` shape divergence corrected its own template snippet) — substrate doc continues to refine itself.

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[Copilot]

Pull request overview

This PR is a follow-up hygiene update to docs/pr-preservation/_patterns.md, correcting terminology and making the documented “Line-leading list-marker confusion” pattern more verifiable and actionable by citing real artefacts already in the repo.

Changes:

• Renames the pattern heading from “CommonMark MD032” to “markdownlint MD032” to correctly attribute the rule ID.
• Replaces the non-existent PR #280 drain-log citation with a verifiable fix-commit citation.
• Clarifies the “pre-commit-lint candidate” note by pointing to the existing tools/hygiene/audit-md032-plus-linestart.sh and specifying the remaining work (extend to -/* or promote to enforcement).