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08cfd9f843
Review (PR #132) caught a regression: removing __run__ from `is_internal_system_branch` exposed legacy `__run__*` branches to the schema-apply blocking-branch checks (schema_apply.rs:104 and :778) and to `branch_list()`, but the v2→v3 sweep ran only inside the publisher's `load_publish_state`. On a pre-v0.4.0 graph whose first write is a schema apply, the blocking-branch check fires before any publish, so apply failed with "found non-main branches: __run__…". The same lazy timing also created a reverse hazard: a user-created `__run__*` branch on a still-v2 graph could be deleted by the first publish's sweep. Fix: run the internal-schema migration in `Omnigraph::open(ReadWrite)` (new `manifest::migrate_on_open`), before the coordinator reads branch state. The sweep now lands before any branch-observing code, and a graph is stamped v3 at open — so the one-time sweep can never catch a legitimately-created branch. Both checks and `branch_list` see the swept graph; correct by construction for every write path. Accepted residual: a read-only open of an unmigrated legacy graph still lists `__run__*` (read-only opens must not write, so they can't sweep). Documented. Regression test `legacy_run_branch_is_swept_on_open_and_does_not_block_schema_apply` confirmed RED before the fix (panicked on the branch_list leak assertion) and GREEN after. Also updates the stale schema_apply.rs comment, the writes.md "Migration code" section, and adds the v3 row to storage.md's migration table. |
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