Fix duplicate path stub creation

[chubes4]

Summary

• Add an atomic DB-backed lock around hierarchical path stub creation.
• Re-resolve and clean up suffixed duplicates if a concurrent insert wins the race.
• Keep upsert idempotency from skipping requested parent/slug repairs when content is unchanged.

Testing

• php tests/resolve-post-by-path-stub-concurrency-smoke.php
• homeboy lint --changed-since origin/main
• homeboy test --changed-since origin/main

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (GPT-5.5)
• Used for: Drafted the concurrency guard, idempotency fix, smoke coverage, and ran scoped verification; Chris reviewed and requested the fix path.

[homeboy-ci]

Homeboy Results — data-machine

Lint

✅ lint — passed

ℹ️ Full options: homeboy docs commands/lint
Deep dive: homeboy lint data-machine --changed-since 26686af

Test

✅ test — passed

ℹ️ Auto-fix lint issues: homeboy refactor data-machine --from lint --write
ℹ️ Collect coverage: homeboy test data-machine --coverage
ℹ️ Pass args to test runner: homeboy test -- [args]
ℹ️ Full options: homeboy docs commands/test
Deep dive: homeboy test data-machine --changed-since 26686af

Audit

✅ audit — passed

• requested_detectors — 3 finding(s)
• intra-method-duplication — 2 finding(s)
• test_coverage — 2 finding(s)
• Total: 7 finding(s)

Deep dive: homeboy audit data-machine --changed-since 26686af

Tooling versions

• Homeboy CLI: homeboy 0.182.0+26e33074
• Extension: wordpress from https://github.com/Extra-Chill/homeboy-extensions
• Extension revision: dd47f26a
• Action: unknown@unknown