docs(bazel): M2 sub-agent orchestration contracts (#13)

[DecisionNerd]

Summary

• Add durable M2/build: migrate CI builds and tests to Bazel with Blacksmith caching #1 Bazel migration orchestration note with role charters, conflict rules, handoff artifact paths, and the #13 → #12 → … → #3 DAG.
• Map every M2 Bazel child (bazel: freeze migration inventory and Cargo/Blacksmith baseline #12–bazel: documentation, observability, and #1 close-readiness evidence #3) to a named role and build: migrate CI builds and tests to Bazel with Blacksmith caching #1 implementation-sequence step; explicitly exclude mobile bindings from all role charters.
• Link the contract from engineering and contributing docs so inventory freeze (bazel: freeze migration inventory and Cargo/Blacksmith baseline #12) can proceed against a checked-in contract.

Test plan

• Docs-only change; no Rust/binding behavior change
• Verify markdown links and role↔issue↔sequence table cover bazel: freeze migration inventory and Cargo/Blacksmith baseline #12–bazel: documentation, observability, and #1 close-readiness evidence #3
• Confirm CI Gate / docs checks green on exact head SHA

Fixes #13

Made with Cursor

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Note

Add M2 sub-agent orchestration contracts for Bazel migration

Adds bazel-migration-orchestration.md defining the orchestration model for the Bazel migration milestone M2, covering agent roles, execution DAG, conflict rules, handoff artifacts, and parallelism guidelines. Updates contributing.md and docs/engineering/README.md to reference the new document.

^{Macroscope summarized ffd909e.}

[coderabbitai]

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