docs(agents): document AO-first workflow

[christso]

Summary

• Add an AO-first orchestration section to AGENTS.md.
• Clarify that AO owns live assignments, worker/session status, worktrees, PR claiming, and visualization.
• Keep GitHub as the external collaboration surface for issues, PRs, reviews, CI, and durable handoff.
• Remove instructions that pushed workers toward unmanaged subagents, project-board claim stamping, duplicate worktrees, or competing live trackers.
• Explicitly de-emphasize Beads: do not use Beads or ep-spawn-agent for routine AO-managed work; only use Beads if explicitly assigned by AO/user for durable planning/backlog work.
• Update remaining Studio/docs-site-only wording to Dashboard, including Browser E2E guidance for both docs and Dashboard verification.

Red/Green UAT evidence

• Red: on origin/main, grep -nE "Use subagents aggressively|spawn a final subagent|AGENT_ID|gh project item|roadmap project is the source" AGENTS.md finds unmanaged subagent spawning guidance and GitHub project-board claim stamping instructions; Browser E2E guidance is scoped only to the docs site and dashboard UI text still uses Studio naming.
• Green: on this branch, the same conflict grep returns no matches, while AGENTS.md now contains the AO-first ownership/lifecycle guidance plus Dashboard/browser E2E wording.

Verification

• git diff --check
• Conflict grep for unmanaged subagent/project-board claim/Beads-default instructions
• Pre-push hooks on git push --force-with-lease passed:
  • build
  • typecheck
  • lint
  • test
  • validate eval YAML files

Notes

This is a fresh branch from current origin/main and does not carry the Beads setup commits from PR #1272/#1274.

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