This PR bootstraps the Agent0 Core repository with foundational tooling
for ToadAid identity verification.

Changes:
- Add CODEOWNERS requiring @ToadAid review for all changes
- Add PR template with checklist
- Add minimal CI workflow (lint, structure, syntax checks)
- Scaffold project structure: /docs, /tools, /scripts, /identity
- Add pyproject.toml for Python project packaging
- Create TOOLING_STANDARD.md documenting CLI contract
- Create verify_identity.py using cast via subprocess
- Create forge_check.py with MPASS gating checks
- Create IDENTITY_QUICKSTART.md user guide
- Add README.md files for each directory

Safety:
- All tools read-only, no wallet mutations
- No secrets or private keys in code
- Safe defaults, clear error messages
- Validates all addresses before use

Closes bootstrap phase, ready for toadgang contributions.

Signed-off-by: toadaid-agent0 <toadaid.agent0@gmail.com>