[purp]

Summary

Extract /label-issue and a shared helper to classify accepted issues and PRs. Correct legacy, malformed, inaccurate and incomplete area/topic labels while preserving unrelated labels and human dispositions.

Related Issue

Closes #5353. Delivers Part 2 of #5276.

Changes

• Classify from relevant expandable evidence: exactly one area and all supported topics. Existing labels describe state, not subject evidence; ambiguity stays local and the labeler posts no comments.
• Share reconciliation with triage, preserving assessment judgment, triage comments and caller-specific confirmations.
• Identify stale closures from the current stale label and matching bot closure metadata, without depending on comment wording or day counts.
• Preview exact requests and verify additions before removals. Native checkpoints support model-free unchanged skips and partial-failure recovery. Fingerprints bind substantive content, identities, authority and taxonomy, ignoring reaction/profile/color noise while retaining raw evidence.

Supports POSIX with one coordinated executor per item; local locking provides neither cross-host serialization nor atomic GitHub writes. Dispatch and provider runtime belong to Part 3.

Live previews report missing canonical topic:dx; no-addition checkpoint paths require approved meta:labeler-checkpoint. This PR provisions neither label and applies no backlog changes.

Release Notes

Testing

• 257 focused Python tests and 19 JavaScript acceptance tests.
• Python syntax, skill metadata, JSON example, 48 local links/anchors, CLI help, and diff checks.
• Ruff 0.14.14 formatting/lint across all 64 Python paths; ty 0.0.94 checks for all 12 labeling scripts.
• Python CI: formatting, lint, full typecheck, SDK and helper tests pass on amd64 and arm64.
• Markdownlint and Mermaid validation pass in the Markdown CI job.
• Manual external skill discovery (npx -y skills add . --list): blocked by EACCES connecting to registry.npmjs.org; the check does not execute.

Checklist

• Conventional Commits and DCO signoffs
• Contributor guidance updated

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[purp]

/ok to test 29b4687