docs: carry agent guidance hardening onto dev2-go (#583)

[Wibias]

Summary

• Carries the squash merge from docs: harden and scope agent guidance #583 onto dev2-go (maintainer Transition workflow).
• Nested AGENTS.md files + CODEOWNERS coverage for agent guidance.
• Root Transition intake on dev already owned by upstream; this keeps dev2-go in sync.

Go port

No Go counterpart — docs/governance only. Decision recorded here per MAINTAINERS Transition rule.

Source

• dev merge: a47aa3f (docs: harden and scope agent guidance #583)

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