skills: make pr-comments implement and ship by PR number

[davidahmann]

Problem

pr-comments was still specified as recommendation-only and did not encode the intended execution behavior for user-provided PR numbers.

Changes

• Converted pr-comments skill from triage-only to implement+ship workflow
• Enforced processing all fetched comments from provided PR numbers regardless of comment state
• Added open vs closed/merged branch strategy with follow-up branch fallback
• Added baseline checks, test requirements by work type, matrix wiring, blocker handling, and evidence/output contracts
• Wired explicit ship handoff to commit-push when changes exist

Validation

• make prepush-full
• ./.tmp/wrkr scan --path ./scenarios/wrkr/scan-mixed-org/repos --json

[chatgpt-codex-connector]

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