pagestore: exercise image layer publication crashes

[hurricane1026]

Summary

• add authenticated process-abort probes for POSIX image-layer create, write, seal, and manifest ADD stages
• add a deterministic IPC sentinel workload and four declarative recovery scenarios
• assert pre-recovery physical state, recovered manifest state, page/LSN integrity, and clean-restart convergence
• wire the scenarios into Meson and standalone CI and update the MVP roadmap

Validation

• ninja -C build-h1
• python3 -m unittest discover -s contrib/pagestore/harness/tests (182 passed)
• meson test -C build-h1 --suite pagestore --print-errorlogs (42 passed)
• four new H1 scenarios repeated three times (12 passed)
• workflow-equivalent standalone compilation

Scope

This covers POSIX process-abort recovery only. The write-before-seal stage does not claim power-loss durability. Physical crash-orphan cleanup remains out of scope until the store has cross-process ownership fencing.

[hurricane1026]

@codex, review

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed2026-09-08T07:39:06.016280Z	52ad06a	Draft marked ready

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[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Can't wait for the next one!

Reviewed commit:6885c52f7a

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[hurricane1026]

@codex, review

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit:ef95d56d9b

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[hurricane1026]

@codex, review

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit:3c30fff954

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[hurricane1026]

@codex, review

[chatgpt-codex-connector]

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

Reviewed commit:52ad06af7b

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