ci: drop housekeeping reviewer-request for native team assignment

[EricAndrechek]

Summary

Now that the wavehouse-admins team has repo access and code-review assignment (load-balanced) configured, reviewer routing is fully GitHub-native — so this removes the now-redundant housekeeping.yml reviewer machinery.

The native flow: the required_reviewers ruleset rule requests the @Wave-RF/wavehouse-admins team on every PR → the team's code-review assignment auto-assigns + load-balances a specific member → their approval satisfies the rule.

Changes

• housekeeping.yml — remove the pick-reviewer step, the Assign + request review step (which used the composite), and the Load board config step. It now does only: path-labeling + PR-title-lint + the title-fail sticky comment.
• Delete .github/actions/assign-and-request-review/ — the composite's only remaining consumer (after dependabot-automerge.yml was removed in ci: replace admin-approval workflow with native required_reviewers #310).
• board-config.env — drop ADMINS (its last consumer gone), killing the team-membership-vs-ADMINS drift; the file now carries only Task Board IDs for triage.yml.
• Doc-sync — AGENTS.md, docs/src/content/docs/development.md, docs/src/content/docs/claude-code.md, CHANGELOG.md.

Net

−229 lines. Bonus: removing the board-config-load step also clears a pre-existing SC2086 actionlint warning on that line.

Testing

make ci green; both pre-push reviewers (pre-push-reviewer, docs-reviewer) → ship_it. The native reviewer-assignment behavior validates on the next non-bypass PR (this PR still triggers main's housekeeping via pull_request_target until merged).

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro Plus

Run ID: a10af1a6-f61f-4fd2-9506-c27f2667ba97

📥 Commits

Reviewing files that changed from the base of the PR and between e816de6 and 3ecf06d.

📒 Files selected for processing (7)

• .github/actions/assign-and-request-review/action.yml
• .github/board-config.env
• .github/workflows/housekeeping.yml
• AGENTS.md
• CHANGELOG.md
• docs/src/content/docs/claude-code.md
• docs/src/content/docs/development.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch drop-housekeeping-reviewer-assign

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch drop-housekeeping-reviewer-assign

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[github-actions]

📚 Docs preview is live → https://ee427e07-wavehouse-docs.wave-rf.workers.dev

• Commit — 3ecf06d: ci: drop housekeeping reviewer-request for native team assignment
• Author — @EricAndrechek, Claude Opus 4.8 (1M context)
• Committed — 2026-06-09 21:09 (UTC-04:00)
• Deployed — 2026-06-09 21:33 EDT