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docs/decisions/0003-realtime-thread-rules.md

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+# Decision 0003: Real-time thread rules
+
+**Status:** Accepted
+
+## Context
+
+Audio glitches and unsafe graph changes can undermine the whole application.
+
+## Decision
+
+The audio callback performs bounded processing using preallocated resources.
+It performs no allocation/free, blocking locks, file I/O, logging, GUI calls,
+plugin loading, or waits. Graphs are prepared outside the callback and active
+graph resources are retired only after safe reclamation.
+
+## Consequences
+
+Thread ownership and publication mechanisms must be documented and tested.
+Any exception to these rules requires explicit evidence and review.