feat: add CW-026 Local Voice plugin

docs/ACCEPTANCE.md

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+# Acceptance results
+
+Fresh acceptance audio was generated on 2026-07-27 using Apple Silicon Metal,
+the production Candle model, the private authorized assets, and the unified
+renderer in Local Voice 0.1.0.
+
+| Profile | Duration | Transcript coverage | Transcript precision | Click-risk seams |
+|---|---:|---:|---:|---:|
+| Donna | 17.49 s | 0.978 | 0.957 | 0 |
+| Chris Engineer | 14.73 s | 0.960 | 0.923 | 0 |
+| Grandpa Bomber | 21.79 s | 0.934 | 0.934 | 0 |
+| Val Holiday | 23.45 s | 0.964 | 0.946 | 0 |
+| Ryan Pitch Meeting | 16.62 s | 0.963 | 0.981 | 0 |
+
+## What the suite verifies
+
+- Every profile and both Ryan roles load from the private runtime.
+- Generated targets contain their expected beginning and final-word marker.
+- Final transcript coverage is at least 0.60.
+- Final transcript precision is at least 0.75, preventing sacrificial context
+  from silently leaking into the finished audio.
+- Every join has a boundary step below the click-risk threshold.
+- Short frames remain at native tempo.
+- Val normalizes only sufficiently long substantive passages toward 170 WPM.
+- Chris uses 30-word safe blocks after a 42-word block proved vulnerable to
+  model truncation.
+- Ryan uses fixed `Yes sir, I do`, `is tight`, and
+  `super easy, barely an inconvenience / Oh really` assets in the acceptance
+  dialogue.
+
+## Human review
+
+Objective acceptance cannot judge character similarity or comic timing.
+The packaged acceptance MP3s are retained for listening review. Future changes
+to reference audio, cadence thresholds, trimming, or asset selection should be
+compared against these files before release.
+
+## Latest jobs
+
+| Profile | Job ID |
+|---|---|
+| Donna | `acceptance-v2-donna` |
+| Chris Engineer | `acceptance-v6-chris-engineer` |
+| Grandpa Bomber | `acceptance-v7-grandpa-bomber` |
+| Val Holiday | `acceptance-v7-val-holiday` |
+| Ryan Pitch Meeting | `acceptance-v9-ryan-pitch-meeting` |