feat(ci): run issue lifecycle audit

[proerror77]

Issue relationship

Closes #467

Change contract

Run the existing lifecycle auditor as the stable, read-only Issue Lifecycle Audit check from the trusted default branch for pull requests and scheduled/manual repository audits.

Out of scope

Required-check enforcement (#460), PR-head status invalidation after linked-issue edits (#480), historical metadata reconciliation (#459), lifecycle policy changes, issue/PR/label/status mutations, runtime deployment, research logic, and trading behavior.

Dependency / merge order

PR #470 / issue #458 merged first. This branch is rebased on 3aae5ddc7c2a699c3d1b6ff95b1f322f6b8bd7e9; #480 exclusively owns and must canary the authoritative Issue Lifecycle status before #460 enables that required context; this PR intentionally emits only Issue Lifecycle Audit.

Focused validation

• RED: the contract test rejected pull_request and a workflow that did not validate proposed YAML
• RED: the contract test rejected the colliding Issue Lifecycle job name before the workflow adopted Issue Lifecycle Audit
• ruby -c .github/scripts/test-issue-lifecycle-workflow.rb — PASS
• ruby .github/scripts/test-issue-lifecycle-workflow.rb — PASS
• ruby .github/scripts/test-issue-lifecycle-workflow.rb .github/workflows/issue-lifecycle.yml — PASS
• ruby -c .github/scripts/issue-lifecycle-audit.rb — PASS
• bash .github/scripts/test-issue-lifecycle-audit.sh — PASS
• actionlint .github/workflows/issue-lifecycle.yml — PASS
• git diff --check origin/main...HEAD — PASS
• Independent code review: PASS
• Scope: 2 files, 107 changed lines

Rollout / rollback impact

Adds the read-only Issue Lifecycle Audit check but does not make it required. Pull-request runs use pull_request_target, execute only default-branch code, fetch the proposed workflow YAML as data, and parse it with the trusted YAML.safe_load contract test before auditing the current PR. Scheduled/manual runs audit live repository metadata and write the result to the step summary. Rollback is a normal revert and does not mutate GitHub issues, statuses, or repository settings.

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📥 Commits

Reviewing files that changed from the base of the PR and between 201325f and 3474ea2.

📒 Files selected for processing (2)

• .github/scripts/test-issue-lifecycle-workflow.rb
• .github/workflows/issue-lifecycle.yml

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