chore: refresh self-improvement decision record

[github-actions]

Summary

• refresh the self-improvement decision record from the latest scheduled analysis
• keep the maintainer-facing Adopt / Reject / Defer state in version control
• preserve the supporting issue and generated artifacts for longer-form review

Maintainer Checklist

• Review the refreshed decision record
• Confirm the current local dependency candidates still match repo policy
• Confirm upstream candidates still fit the evidence, overlap, and false-positive rubric
• Edit any final Adopt / Reject / Defer calls directly in the decision record before merging
• Merge only if the decision record reflects the maintainer's final call for this cycle

Current Local Candidates

• #51 chore(deps): bump the dev-dependencies group across 1 directory with 5 updates
• #50 chore(deps): bump markdown-it and markdownlint-cli

Current Upstream Candidates

• #159 Add pattern #34: hallucinated data, fake citations, and fabricated links
• #155 Add pattern #34: casual intensifiers and dismissive amplifiers
• #154 Add secondhand-text exemption to Detection Guidance
• #151 Add Spanish pattern catalog with automatic language detection (v2.9.0)
• #147 Extend §13 to cover subjectless fragments from humanizing overcorrection
• #145 Revise README for Humanizer installation instructions

Supporting Files

• Decision record
• Generated issue body
• Generated decision log

Notes

• repo intelligence artifacts remain attached to the workflow run
• this PR is intentionally draft-only for human review