Fix artifact cleanup blocked-only completion

[chubes4]

Summary

• Return a successful complete_with_blockers terminal state when artifact cleanup until-empty can only skip protected dirty/unpushed candidates.
• Include blocker counts and reason summary on the terminal response.
• Preserve no_progress for mixed or unexpected skip reasons.

Fixes #810.

Testing

• php tests/cleanup-until-empty-blocked-only.php
• php tests/artifact-cleanup-plan-output-contract.php
• php tests/cleanup-remaining-work-summary.php
• php -l inc/Workspace/CleanupRunService.php && php -l tests/cleanup-until-empty-blocked-only.php
• Full for test in tests/*.php; do php "" || exit 0; done stopped at existing tests/worktree-metadata-reconciliation-finalizer-contract.php contract failure.

AI assistance

• AI assistance: Yes
• Tool(s): gpt-5.5 via OpenCode
• Used for: Inspecting the cleanup runner behavior, implementing the blocked-only terminal state, adding the focused regression test, and running local verification.

[homeboy-ci]

Homeboy Results — data-machine-code

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
Deep dive: homeboy lint data-machine-code --changed-since 8c4fa27

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-code-lint-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-code-lint-quality-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine-code/actions/runs/28209550898

Test

✅ test — passed

ℹ️ Auto-fix lint issues: homeboy refactor data-machine-code --from lint --write
ℹ️ Collect coverage: homeboy test data-machine-code --coverage
ℹ️ Save test baseline: homeboy test data-machine-code --baseline
ℹ️ Pass args to test runner: homeboy test -- [args]
ℹ️ Full options: homeboy docs commands/test
Deep dive: homeboy test data-machine-code --changed-since 8c4fa27

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-code-test-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-code-test-quality-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine-code/actions/runs/28209550898

Audit

✅ audit — passed

• audit — 89 finding(s)
• Total: 89 finding(s)

Deep dive: homeboy audit data-machine-code --changed-since 8c4fa27

Artifacts and drill-down

• CI results artifact: homeboy-ci-results-data-machine-code-audit-quality-Linux-node24 contains immediate command JSON for this action invocation.
• Observation artifact: homeboy-observations-data-machine-code-audit-quality-Linux-node24 contains exported Homeboy run history for deeper queries.
• Drill-down: download the observation artifact, then run homeboy runs import <dir>, homeboy runs list, and homeboy runs findings <run-id>.
• Artifacts are attached to the workflow run: https://github.com/Extra-Chill/data-machine-code/actions/runs/28209550898

Tooling versions

• Homeboy CLI: homeboy 0.261.0+6ac880c96e78+d9d5bef
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: 29799d56
• Action: unknown@unknown