fix(session,server): lock-safe Session.Messages access + 409-busy guard (#3590)#3606

Merged

dgageot merged 8 commits into

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fix/3590-session-messages-locking

Jul 13, 2026

Commits on Jul 11, 2026

fix(session): lock-safe Messages access in AddMessage/branch/fork
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fix(runtime): route hot-path Messages reads through locked accessors
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fix(server): ForkSession must not iterate a live session's Messages
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fix(server): reject AddMessage/UpdateMessage with 409 while streaming
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fix(server,app): extend 409-busy guard to attached/TUI RunStream ownership
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fix(session,runtime): compaction sentinel must use CompactionInput's own snapshot count
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fix(server): hold streaming lock across AddMessage/UpdateMessage mutation
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fix(app): add missing sync import in app_test.go
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