Reject zero cleanup report limits

[chubes4]

Summary

• Require positive --limit values for cleanup/report pagination surfaces instead of silently treating 0 as unbounded or 1.
• Keep artifact cleanup's full scan available only through the explicit --exhaustive mode, and update CLI/ability help text to document that contract.
• Add smoke coverage for cleanup artifacts, metadata reconciliation, active-no-signal reports, invalid negative limits, and budgeted/unbounded behavior.

Closes #493

Verification

• php tests/smoke-worktree-cleanup-artifacts.php
• php tests/smoke-worktree-cleanup-artifacts-bounded.php
• php tests/smoke-worktree-metadata-reconcile.php
• php tests/smoke-worktree-cleanup-cli.php
• homeboy test --path /Users/chubes/Developer/data-machine-code@fix-issue-493-limit-zero-semantics --extension wordpress (passes, but host-smoke pattern did not match this repo's tests/smoke-*.php files)
• homeboy lint --path /Users/chubes/Developer/data-machine-code@fix-issue-493-limit-zero-semantics --extension wordpress --changed-only

Notes

• Full homeboy lint --path /Users/chubes/Developer/data-machine-code@fix-issue-493-limit-zero-semantics --extension wordpress still reports the existing repo-wide PHPStan baseline (173 findings); changed-only lint passes.

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (gpt-5.5)
• Used for: Implementation draft, tests, and verification; Chris remains responsible.

[homeboy-ci]

Homeboy Results — data-machine-code

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
ℹ️ Save lint baseline: homeboy lint data-machine-code --baseline
Deep dive: homeboy lint data-machine-code --changed-since 3d48737

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/26775054825

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 Pass args to test runner: homeboy test -- [args]
ℹ️ Full options: homeboy docs commands/test
Deep dive: homeboy test data-machine-code --changed-since 3d48737

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/26775054825

Audit

✅ audit — passed

• audit — 48 finding(s)
• Total: 48 finding(s)

Deep dive: homeboy audit data-machine-code --changed-since 3d48737

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/26775054825

Tooling versions

• Homeboy CLI: homeboy 0.216.2+fda89f5
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: c9f28f7b
• Action: unknown@unknown