docs(agents): remove local orchestration guidance

[christso]

Summary

This follows up on #1333 because that PR was merged prematurely with local/private orchestration guidance in the public AgentV AGENTS.md.

The public guidance now states the durable boundary directly: AgentV Beads are for committed AgentV deliverables, while local orchestration policies, cross-repo research records, Agent Mail endpoints, private launcher details, and private asset/evidence repo policy belong in untracked AGENTS.md.local or the operator workspace.

Lines Changed

• Generalized the private launcher/NTM worker guidance from old lines 120-122 into new line 120.
• Replaced the agent-orchestrator /home/entity/... Beads ownership guidance from old lines 127-129 with generic public ownership guidance at new lines 125-127.
• Generalized the worker claim wording from old line 132 to new line 130.
• Removed local Agent Mail URL/script/project-key details from old lines 138-140 and replaced them with local-override guidance at new lines 136-138.
• Made Agent Mail reservation guidance conditional on local configuration from old lines 146-147 to new lines 142-143.
• Moved private asset repository policy behind local overrides from old line 485 to new line 481.

Verification

• git diff --check -- AGENTS.md
• awk 'BEGIN{ok=1} /^```/{f=!f} END{if(f){print "Unclosed fenced code block"; ok=0} exit ok?0:1}' AGENTS.md
• node -e "const fs=require('fs'); const s=fs.readFileSync('AGENTS.md','utf8'); if(!s.endsWith('\\n')){console.error('AGENTS.md missing trailing newline'); process.exit(1)} console.log('AGENTS.md trailing newline ok')"
• rg -n "/home/entity|agent-orchestrator|ep-spawn-agent|mcp_agent_mail|127\\.0\\.0\\.1|EntityProcess agent plugin|AGENTV_NTM_SESSION|ntm spawn agentv" AGENTS.md || true

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