feat(bootstrap): add Agent Zero to registry + branded defaults

[POWERFULMOVES]

Summary

• Agent Zero orchestrator added to bootstrap/registry.json as a first-class service group with 5 declarative variables
• brand_defaults.py extended with _ensure_agent_zero_defaults() — auto-generates MCP_CLIENT_SECRET (32-byte urlsafe) and seeds TensorZero model routing defaults
• env.shared.example updated with Agent Zero section
• SEEDED_BRANDED_DEFAULTS.md documents the new defaults and one-line installer integration path

Why

Agent Zero's new one-line installer (irm https://ps.agent-zero.ai | iex) makes bootstrap trivial, but PMOVES-branded instances need auto-generated MCP auth and model routing. After this PR, make env-setup handles that automatically.

Variables Added

Variable	Default	Generated?
A0_SET_chat_model	tensorzero::model_name::chat_default	Seeded
A0_SET_utility_model	tensorzero::model_name::util_default	Seeded
A0_SET_embedding_model	tensorzero::embedding_model_name::embed_default	Seeded
MCP_CLIENT_SECRET	(auto)	32-byte urlsafe token
AGENTZERO_JETSTREAM	true	Seeded

Test plan

• python pmoves/tools/brand_defaults.py --env-file /tmp/test generates all 5 vars
• make env-setup succeeds on fresh clone
• Agent Zero starts with generated MCP_CLIENT_SECRET
• No transcribe-and-fetch changes in diff

🤖 Generated with Claude Code

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📥 Commits

Reviewing files that changed from the base of the PR and between e7737ad and af20d9e.

📒 Files selected for processing (4)

• pmoves/bootstrap/registry.json
• pmoves/docs/operations/SEEDED_BRANDED_DEFAULTS.md
• pmoves/env.shared.example
• pmoves/tools/brand_defaults.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch feat/agent-zero-branded-defaults

📝 Coding Plan

• Generate coding plan for human review comments

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