[L] Delete GHCR overlay images (post-cutover, +30 days from #M)

[cbeaulieu-gt]

Parent epic: #273 · Spec: docs/superpowers/specs/2026-05-20-codex-pivot.md §6, §9 row 12, §11 (#L)

Scope

Manual GHCR UI deletion of the four runtime images:

• ghcr.io/glitchwerks/claude-runtime-base
• ghcr.io/glitchwerks/claude-runtime-review
• ghcr.io/glitchwerks/claude-runtime-fix
• ghcr.io/glitchwerks/claude-runtime-explain

Acceptance

• All four packages return 404 from GHCR
• No remaining digest-pin references in any tracked file (verify via grep -r 'ghcr.io/glitchwerks/claude-runtime' .)

Gating

• Wait 30 days from #M completion (NOT from v3 release) — spec §9 row 12 timing model
• #M must close before this 30-day clock starts (audit-completion-gates-clock model)

Decoupling rationale

This timing model decouples release timing from audit completion — the cutover can proceed against the OAuth deadline (~2026-06-20) without #M becoming a release blocker, while still guaranteeing external consumers receive 30 days notice before image deletion.

🤖 Generated by Claude Code on behalf of @cbeaulieu-gt