Regenerate stale gh-aw lock files and prune obsolete agentic workflows (#7622)

* Regenerate stale gh-aw lock files with compiler v0.71.5

Five agentic-workflow lock files were compiled with outdated gh-aw
versions (repo-health-check/groom/investigate on v0.45.4, issue-triage
on v0.58.0, add-tests on v0.67.1) and were never regenerated. This
recompiles them with the current v0.71.5 compiler from their unchanged
.md sources.

Why this matters:
- The v0.45.4 locks pinned actions/download-artifact at a Node-20
  version that GitHub force-upgrades on 2026-06-16, which would break
  these workflows. They now use download-artifact v8.0.1 (Node 24).
- repo-health-check (detection job) and repo-health-investigate (agent
  job) have been failing with exit 22 on binary/CLI install steps; the
  newer setup action hardens these install paths.
- Removes compiler-version drift so all locks match the installed
  toolchain.

Only generated .lock.yml files change; no workflow source (.md) is
modified. ci-scan and ci-scan-feedback were already on v0.71.5 and are
untouched.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

* Prune obsolete agentic workflows

Remove inclusive-heat-sensor.yml (every run startup_failures, never executes)
and the add-tests workflow (never activated, 30/30 skipped) plus its
orphaned shared/repo-build-setup.md import. Drop the inclusive-heat-sensor
row from copilot-instructions.md.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

---------

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: kotlarmilos

.github/copilot-instructions.md

@@ -173,7 +173,6 @@ GitHub Actions in `.github/workflows/`:
 |----------|---------|---------|
 | `copilot-setup-steps.yml` | Manual | Remote Copilot Coding Agent build environment |
 | `find-similar-issues.yml` | Issue opened | AI-powered duplicate detection for new issues |
-| `inclusive-heat-sensor.yml` | Comments | Detect heated language in issue/PR comments |
 
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