(MOT-4299) refactor: delegate release notifications to Release Control

[ytallo]

What changed

• removes direct Slack calls from Release, Promote Worker, and Repair worker release
• removes notification status from release and promotion evidence so artifacts contain only release truth
• retains the legacy --notification-result CLI argument as an ignored compatibility input for reruns of older workflows
• updates the release SOP to make Release Control the notification owner

Why

Release and promotion are two states of the same deployment. Posting from independent workflows created duplicate root messages and coupled notification mechanics to execution evidence.

Impact

GitHub Actions now executes releases and emits terminal evidence only. The companion Release Control change consumes correlated evidence, maintains one root message per Release run, and keeps history in its thread. Out-of-band runs that are not correlated to a Release Control operation no longer notify Slack.

Companion: iii-hq/release-control#4

Validation

• focused release_result.py tests
• Python bytecode compilation
• YAML parsing for all changed workflows
• Actionlint for Release, Promote Worker, and Repair worker release
• git diff --check

Refs MOT-4299

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[github-actions]

skill-check — worker

0 verified, 54 skipped (no docs/).

Layer	Result
structure	✓
vale	✓
ai	✓
render	✓

Four for four. Nicely done.