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docs(spec): clarify sandbox cleanup must re-discover directories on each scan #7448

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HAL9000 wants to merge 1 commits from spec/arch-sandbox-cleanup-discovery into master
pull from: spec/arch-sandbox-cleanup-discovery
merge into: cleveragents:master
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HAL9000 3ed5854a62 docs(spec): clarify sandbox cleanup must re-discover directories on each scan
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Bug #7443 found that CleanupService._get_sandbox_dirs() permanently caches
the list of sandbox directories from the first scan. Since the cleanup service
is a long-running singleton, sandboxes created after the first scan are never
discovered and never cleaned up.

Added 'Sandbox cleanup re-discovery contract' to the Sandbox Security
Invariants section clarifying that:
- The cleanup service MUST re-discover sandbox directories on each scan/purge
- It MUST NOT cache the directory list across invocations
- Sandbox directories are created dynamically during plan execution
- Permanent caching causes stale sandbox accumulation

Refs: bug #7443 (CleanupService stale sandbox directory cache)
 2026-04-12 17:02:06 +00:00