Three classes of robustness issue caught on the second pass — all
revolve around malformed YAML tipping ``parseVoiceRecordKey`` or
``_voice_record_key`` into a crash instead of the documented
fallback.
* **Parser crashed on non-string YAML scalars.** ``config.get full``
returns raw ``yaml.safe_load`` output, so ``voice.record_key: 1``
or ``voice.record_key: true`` in a hand-edited config would hit
``.trim()`` on a number/bool and throw, breaking startup and
every mtime re-apply. Accept ``unknown`` at the signature, guard
with ``typeof raw !== 'string'``, and fall back to the default.
* **Backend blew up on non-dict ``voice:``.** Same YAML hazard on
the gateway side: ``voice: true`` / ``voice: cmd+b`` left
``_load_cfg().get("voice")`` as a bool/str, so ``.get("record_key")``
raised AttributeError and took every ``voice.toggle`` branch down
with it. Centralised the lookup in a single
``_voice_record_key()`` helper that ``isinstance``-guards both
``voice`` and ``record_key`` and falls back to ``ctrl+b``.
* **Multi-modifier chords silently dropped extras.** The previous
validator only checked the first modifier token, so ``ctrl+alt+r``
silently parsed as ``ctrl+r`` and ``cmd+ctrl+b`` as ``super+b`` —
a typo bound a different shortcut than the user configured.
Reject multi-modifier spellings outright; the classic CLI only
supports single-modifier bindings via prompt_toolkit's ``c-x`` /
``a-x`` rewrite, so this matches CLI parity.
Coverage added:
* ``parseVoiceRecordKey`` fallback on ``1`` / ``true`` / ``null`` /
``undefined`` / ``{}``.
* ``parseVoiceRecordKey`` fallback on ``ctrl+alt+r`` /
``cmd+ctrl+b`` / ``alt+ctrl+space``.
* ``test_voice_toggle_handles_non_dict_voice_cfg`` exercises
every non-dict ``voice:`` shape (bool, str, None, int, list) and
asserts each falls back to ``record_key: 'ctrl+b'``.
Suite: 581/581 TUI vitest green, 3/3 backend voice tests green,
tsc --noEmit clean.
Brooklyn Nicholson
14f61bbd63