fix(20): revise plan based on checker feedback

- Task 2: Changed from 'auto' to 'checkpoint:pass' (no code changes needed)
- Task 3: Explicitly state line 111 destructuring modification
- Added VUMTR-01 deferral note in objective section
- Updated files_modified to exclude VuContext.js (auto-exposes via pattern)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.planning/phases/20-vumeter-fixes/20-01-PLAN.md

@@ -6,8 +6,8 @@ wave: 1
 depends_on: []
 files_modified:
   - jam-ui/src/hooks/useVuHelpers.js
-  - jam-ui/src/context/VuContext.js
   - jam-ui/src/hooks/useMixerHelper.js
+  # Note: VuContext.js not modified - it automatically exposes removeVuState via existing pattern
 autonomous: true
 
 must_haves:
@@ -43,8 +43,10 @@ Purpose: Address HIGH priority memory leak (VUMTR-02, VUMTR-03) where vuStates o
 
 Output:
 - Modified useVuHelpers.js with removeVuState function
-- Modified VuContext.js exposing removeVuState
+- Modified VuContext.js exposing removeVuState (automatic via existing pattern)
 - Modified useMixerHelper.js calling removeVuState on mixer cleanup
+
+Note: VUMTR-01 (VU callback throttling) is intentionally deferred as a performance optimization, not a memory leak (per Phase 19 audit).
 </objective>
 
 <execution_context>
@@ -122,13 +124,12 @@ removeVuState callback exists in useVuHelpers.js and is exported in the return o
   </done>
 </task>
 
-<task type="auto">
-  <name>Task 2: Expose removeVuState through VuContext</name>
-  <files>jam-ui/src/context/VuContext.js</files>
-  <action>
-The VuContext.js file already passes all of useVuHelpers return values through the context provider (line 7: `const vuHelpers = useVuHelpers()`), so removeVuState is automatically available.
+<task type="checkpoint:pass">
+  <name>Task 2: Verify removeVuState is exposed through VuContext</name>
+  <rationale>
+The VuContext.js file already passes all of useVuHelpers return values through the context provider (line 7: `const vuHelpers = useVuHelpers()`), so removeVuState is automatically available after Task 1 completes.
 
-**Verification only** - No code changes needed. The existing pattern at lines 6-13 passes the entire vuHelpers object to the context, which now includes removeVuState:
+The existing pattern at lines 6-13 passes the entire vuHelpers object to the context:
 
 ```javascript
 export const VuProvider = ({ children }) => {
@@ -142,15 +143,15 @@ export const VuProvider = ({ children }) => {
 };
 ```
 
-Consumers using `useVuContext()` will automatically have access to removeVuState.
-  </action>
+No code changes required - consumers using `useVuContext()` will automatically have access to removeVuState once Task 1 adds it to useVuHelpers.
+  </rationale>
   <verify>
 1. Read VuContext.js to confirm the pattern passes all useVuHelpers exports
-2. Verify useVuHelpers() is called and spread into context value
+2. Verify useVuHelpers() is called and its result is passed to context value
 3. Confirm no changes are needed to VuContext.js
   </verify>
   <done>
-VuContext automatically exposes removeVuState through the existing vuHelpers spread pattern
+VuContext automatically exposes removeVuState through the existing vuHelpers spread pattern - no modifications needed
   </done>
 </task>
 
@@ -167,10 +168,7 @@ Implementation steps:
    import { useVuContext } from '../context/VuContext.js';
    ```
 
-   Update line 111 to destructure removeVuState alongside updateVU3:
-   ```javascript
-   const { updateVU3, removeVuState } = useVuContext();
-   ```
+   Modify line 111 from `const { updateVU3 } = useVuContext();` to `const { updateVU3, removeVuState } = useVuContext();` to destructure removeVuState alongside updateVU3.
 
 2. **Add cleanup effect that watches for mixer removals** - After the existing `useEffect` that syncs `isReady` (around line 317), add a new effect that detects when mixers are removed and cleans up their VU state: