[SLOP] Upstream sync v3.17.0 → v3.17.4

[github-actions]

Draft PR for the SLOP batch of upstream v3.17.0 → sync/upstream/v3.17.4-slop.

This PR is not auto-mergeable. Phase 1 of the upstream-analyzer pipeline is advisory only.

Commits in this batch

• 6713b30c refactor(hooks): drop no-op directory injector callbacks -- Removed unused 'tool.execute.before' callback with no functional impact, indicating pointless churn.
• cfd152ad docs(features): update agent count and verify category list -- Added two new features ('review-work' and 'ai-slop-remover') with overly broad, vague descriptions lacking concrete behavior deltas or clear value propositions.

Analysis: #12

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Summary by cubic

Sync upstream v3.17.0 → v3.17.4. Removes no‑op hook callbacks, internalizes types, standardizes null checks, updates features/docs, and bumps oh-my-opencode and all platform packages to 3.17.4.

• Refactors

  • Drop tool.execute.before from directory/readme injectors; add typed hook interfaces and explicit factory return types.
  • Make CreateToolsResult and LoadBuiltinCommandsOptions internal (no public API change).
  • Standardize null guards in the background loop detector.

• Docs

  • Add review-work and ai-slop-remover; remove playwright-cli.
  • Update AGENTS.md generation dates to 2026‑04‑11; config schema count 32.
  • Refresh CONTRIBUTING tool/hook counts and prerequisites; add new CLA signatures.

^{Written for commit 0a684d7. Summary will update on new commits.}