[wufangyong973]

Closes #151

Scaffold the .agents/skills/github-triage/ skill so an assistant can audit and backfill type: / scope: labels without re-discovering the taxonomy on every pass.

What changed

• SKILL.md — operational runbook: the full type:* / scope:* matrix (sourced from .github/labels.yml), resolution rules for unrecognized scopes and -private packages, and the four-step Scan → Audit → Review → Apply workflow. Follows the front-matter + H1 + Companion Scripts + Operational Invariants structure of the sibling github-issues / github-pr skills, and the agent-skills canons (runtime-execution runbook, no metadata duplication).
• scripts/triage-audit.sh — pure POSIX shell diagnostic. Resolves the triangular upstream remote, parses Conventional Commit titles, cross-references the vocabulary in .github/labels.yml, and emits an unadorned TSV (NUMBER\tTYPE\tSCOPE\tSTATUS\tMISSING_LABELS\tUNRECOGNIZED_SCOPES). Supports --unlabeled, --since N, --prs, --json, and --repo. Shunts output above 8 KB to /tmp/. Set executable (chmod +x).
• AGENTS.md — new ## 3. Agent Skills section registering the skill.
• llms.txt — a single directory-level entry under Agent & Contributor Orientation, delegating depth to SKILL.md per the llms-txt-must-index-surfaces-not-individual-files and llms-txt-must-delegate-depth canons.

Verification

Ran the script offline against a simulated gh fixture (no network, no live state):

• TSV columns align; type: feat on feat(lsp) and type: refactor + scope: core on refactor(core) are reported as missing when the labels are absent;
• unrecognized scopes lsp and repo-lint are surfaced in the UNRECOGNIZED_SCOPES column without inventing labels;
• --unlabeled filters to rows with at least one gap; --since N starts the backfill pass at N; --prs merges PR rows;
• an oversized input triggers the 8 KB /tmp/ shunt with the [OUTPUT TRUNCATED] banner.
  The script's exit code is propagated through the shunt wrapper, and $EXIT_CODE is preserved across the set -e boundary.

No change to CLI semantics, canon lints, or Rust build; pure agent-skill addition.

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