Add Vosk keystroke eval tooling and findings

exploration/vosk/keystrokes/.gitignore

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+literal/manifest.jsonl
+literal/samples/
+nato/manifest.jsonl
+nato/samples/
+eval_runs/

exploration/vosk/keystrokes/findings.md

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+# Vosk Keystroke Grammar Findings
+
+- Date (UTC): 2026-02-28
+- Run ID: `run-20260228T200047Z`
+- Dataset size:
+  - Literal grammar: 90 samples
+  - NATO grammar: 90 samples
+- Intents: 9 (`ctrl|shift|ctrl+shift` x `d|b|p`)
+
+## Results
+
+| Model | Literal intent accuracy | NATO intent accuracy | Literal p50 | NATO p50 |
+|---|---:|---:|---:|---:|
+| `vosk-small-en-us-0.15` | 71.11% | 100.00% | 26.07 ms | 26.38 ms |
+| `vosk-en-us-0.22-lgraph` | 74.44% | 100.00% | 210.34 ms | 214.97 ms |
+
+## Main Error Pattern (Literal Grammar)
+
+- Letter confusion is concentrated on `p -> b`:
+  - `control p -> control b`
+  - `shift p -> shift b`
+  - `control shift p -> control shift b`
+
+## Takeaways
+
+- NATO grammar is strongly validated for this keystroke use case (100% on both tested models).
+- `vosk-small-en-us-0.15` is the practical default for command-keystroke experiments because it matches NATO accuracy while being much faster.
+
+## Raw Report
+
+- `exploration/vosk/keystrokes/eval_runs/run-20260228T200047Z/summary.json`

exploration/vosk/keystrokes/intents.json

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+[
+  {
+    "intent_id": "ctrl+d",
+    "literal_phrase": "control d",
+    "nato_phrase": "control delta",
+    "letter": "d",
+    "modifier": "ctrl"
+  },
+  {
+    "intent_id": "ctrl+b",
+    "literal_phrase": "control b",
+    "nato_phrase": "control bravo",
+    "letter": "b",
+    "modifier": "ctrl"
+  },
+  {
+    "intent_id": "ctrl+p",
+    "literal_phrase": "control p",
+    "nato_phrase": "control papa",
+    "letter": "p",
+    "modifier": "ctrl"
+  },
+  {
+    "intent_id": "shift+d",
+    "literal_phrase": "shift d",
+    "nato_phrase": "shift delta",
+    "letter": "d",
+    "modifier": "shift"
+  },
+  {
+    "intent_id": "shift+b",
+    "literal_phrase": "shift b",
+    "nato_phrase": "shift bravo",
+    "letter": "b",
+    "modifier": "shift"
+  },
+  {
+    "intent_id": "shift+p",
+    "literal_phrase": "shift p",
+    "nato_phrase": "shift papa",
+    "letter": "p",
+    "modifier": "shift"
+  },
+  {
+    "intent_id": "ctrl+shift+d",
+    "literal_phrase": "control shift d",
+    "nato_phrase": "control shift delta",
+    "letter": "d",
+    "modifier": "ctrl+shift"
+  },
+  {
+    "intent_id": "ctrl+shift+b",
+    "literal_phrase": "control shift b",
+    "nato_phrase": "control shift bravo",
+    "letter": "b",
+    "modifier": "ctrl+shift"
+  },
+  {
+    "intent_id": "ctrl+shift+p",
+    "literal_phrase": "control shift p",
+    "nato_phrase": "control shift papa",
+    "letter": "p",
+    "modifier": "ctrl+shift"
+  }
+]

exploration/vosk/keystrokes/literal/phrases.txt

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+# Keystroke literal grammar labels.
+# One phrase per line.
+control d
+control b
+control p
+shift d
+shift b
+shift p
+control shift d
+control shift b
+control shift p

exploration/vosk/keystrokes/models.example.json

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+[
+  {
+    "name": "vosk-small-en-us-0.15",
+    "path": "/tmp/vosk-models/vosk-model-small-en-us-0.15"
+  },
+  {
+    "name": "vosk-en-us-0.22-lgraph",
+    "path": "/tmp/vosk-models/vosk-model-en-us-0.22-lgraph"
+  }
+]

exploration/vosk/keystrokes/nato/phrases.txt

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+# Keystroke NATO grammar labels.
+# One phrase per line.
+control delta
+control bravo
+control papa
+shift delta
+shift bravo
+shift papa
+control shift delta
+control shift bravo
+control shift papa