docs(orchestration): use br-first Beads workflow

[christso]

Refs agentv-9gh

Summary

• Update AGENTS.md so normal AgentV coordination is Beads-first with br / beads_rust going forward.
• Remove AO workflow guidance from AgentV instructions.
• Point worker launch to upstream EntityProcess agent plugin tooling instead of carrying a local AgentV wrapper.

Scope Change

The bead-aware launcher script is being upstreamed to EntityProcess/agent-plugins instead of living in AgentV. A separate tmux worker is running in /home/entity/projects/EntityProcess/agent-plugins.worktrees/bead-spawn-agent-upstream on branch feat/bead-spawn-agent-upstream to implement that.

Red/Green UAT

Red, before this update:

• AGENTS.md still described AO/GitHub as the default internal orchestration path.
• The first version of this branch carried scripts/bead-spawn-agent.sh locally and included bd/Dolt compatibility language.

Green, with this branch:

• AGENTS.md now makes Beads the durable task graph and uses br commands for ready/show/claim/create/dep/close/sync.
• The local scripts/bead-spawn-agent.sh file has been removed from AgentV so the launcher can live in the upstream agent plugin repo.
• Stale bd, Dolt, local launcher, and AO workflow references are absent from AGENTS.md.

Verification

• git diff --check
• rg -n "AO|ao |Composio|AO-managed|orchestrator" AGENTS.md returned no matches.
• rg -n -e 'bd ' -e 'Dolt' -e 'dolt' -e 'scripts/bead-spawn-agent.sh' AGENTS.md returned no matches.
• Earlier pre-push hook passed build, typecheck, lint, test, and validate eval YAML files. Latest AO-removal commit was pushed with --no-verify by request because it is docs-only.

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