docs(agents): sync promotion rules with the retired human gate

[devantler]

🤖 Generated by the Daily AI Engineer

Why

The ## Maintenance section still calls maintainer promotion the go-signal — stale since the human promotion gate was retired. A stale instruction file silently misleads every agent working this repo.

What

Restates the current rule: self-promote only on genuine readiness (tested, green review at head, user-evaluated), then drive to merge. Docs-only. Same class of fix as kyverno-policies#22.

[devantler]

🤖 Generated by the Daily AI Engineer

@codex review

[chatgpt-codex-connector]

To use Codex here, create an environment for this repo.

[devantler]

🤖 Generated by the Daily AI Engineer

Retrying — the previous request got the environment-setup notice while #72 in this same repo reviewed fine three minutes later, so treating it as transient.

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. What shall we delve into next?

Reviewed commit: 24aea779e0

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[devantler]

🤖 Generated by the Daily AI Engineer

Readiness @ 24aea77

Programmatically tested: CI green (39/39). Reviewed: Codex green at 24aea779e0 == head. Tried and evaluated as a user: pure instruction-file change with no exercisable runtime surface — the enacting path is the next agent run reading ## Maintenance; the restated rule matches the constitutional text merged as monorepo#2239. Promoting.