[codex] Add worker pod termination status logs

[bill-ph]

Summary

• add a reusable control-plane helper that summarizes worker pod phase/reason/message and selected container state, reason, exit code, signal, timestamps, and restart count
• include that summary on Worker pod terminated. logs from pod reconciliation
• snapshot and log pod/container status before the health-check path deletes an unresponsive worker pod

Validation

• just test-controlplane-k8s
• just lint

[github-actions]

Test Impact Plan

Deterministic summary of how this PR changes tests, CI runners, and coverage-risk signals.

Summary

Area	Added	Changed	Deleted
Test files	0	1	0
E2E/journey files	0	0	0
Workflow files	0	0	0

Signals

• Test cases: +0 / -0
• Assertions: +12 / -0
• Skips or known failures added: 0
• Workflow continue-on-error added: 0
• Workflow path filters added: 0
• Test commands removed from justfile: 0
• E2E/journey retry lines added: 0

Coverage risk: neutral or increased

No coverage-reduction warnings detected.