2026.7.23-canary.948

feat(server): improve doc gc (#15329)

#### PR Dependency Tree


* **PR #15329** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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## Summary by CodeRabbit

* **Improvements**
* Enhanced reliability of document reconciliation/projection by
improving failure tracking and resumability after partial runs.
* Upgraded checkpoint persistence to include additional state (including
parser version and failure counts) so interrupted processing can resume
accurately.
* Improved recovery behavior so repeated rebuilds and parser-upgrade
scenarios correctly complete and reset failure indicators when
appropriate.
* **Tests**
* Added integration coverage for checkpoint failure/resume semantics,
including partial limits and upgrade-style recovery behavior.
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