chore: add AO-first agent workflow guidance

[christso]

Summary

• Move detailed AgentV agent guidance into committed Phoenix-style skills under .agents/skills/.
• Add .claude/skills as a symlink to .agents/skills for Claude compatibility.
• Keep AGENTS.md as compact bootstrap context plus AO-first orchestration rules.
• Align workflow guidance with the updated decision: AO manages live sessions, worker ownership, worktrees, PR claiming, status, and visualization; GitHub remains the external collaboration surface.
• De-emphasize Beads as optional durable planning/backlog context only when explicitly assigned by the user/AO.
• Disable ep-spawn-agent for normal AO-managed AgentV work to avoid unmanaged agents, duplicate worktrees, duplicate PRs, and competing lifecycle ownership.
• Ignore generated Beads/Dolt state in Biome so pre-push lint does not scan local database internals.

Red/Green UAT evidence

• Red (before the AO alignment commit): grep -RInE "Beads-first|decentralized orchestration|ALL issue tracking|repo-standard bead launcher|ep-spawn-agent <|Beads is AgentV" AGENTS.md .agents/skills found Beads-only/decentralized orchestration language and ep-spawn-agent <bead-id> as the default launch path.
• Green (after the AO alignment commit): git diff --check; symlink check for .claude/skills -> ../.agents/skills; and the same conflict grep passed with no matches for Beads-only/default-launch language.

Verification

• git diff --check
• .claude/skills symlink check
• Conflict grep for Beads-only/default-launch instructions
• git push pre-push hooks passed: build, typecheck, lint, test, and eval YAML validation.

Follow-up

• If Beads remains in the repository, use it only for explicit AO/user-assigned durable planning/backlog work, not routine live execution tracking.

[christso]

Closing because the requested follow-up is moving to a fresh AO-first branch from origin/main without carrying the Beads setup commits.