assistant: grey out the mic when the model cannot hear

AssistantModule keeps each router model's input_modalities and exposes
hears: the model loading, else the first not unloaded (the daemon's
rule), reports audio. Unknown inputs or a router that is down count as
yes; the daemon's error covers the rest. The model list is now read on
every canvas open, not only when a preferred model is set, so hears is
current when the card shows.

Checked: the rule against the router's live /models (Gemma resident:
on; Qwen resident or loading: off; router down: on). Not yet seen by
eye after a desktop shell reload.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 9 insertions, 4 deletions

diff --git a/docs/superpowers/specs/2026-10-19-assistant-mic-design.md b/docs/superpowers/specs/2026-10-19-assistant-mic-design.md
index 118ab08..07959e5 100644
--- a/docs/superpowers/specs/2026-10-19-assistant-mic-design.md
+++ b/docs/superpowers/specs/2026-10-19-assistant-mic-design.md
@@ -70,10 +70,15 @@ events, which the canvas already shows.
 
 ## Not included
 
-A shortcut or a bind that opens the card recording, a level meter,
-hiding the mic when the loaded model has no audio input (the daemon's
-error says so after the recording), and editing the transcript before
-it is asked.
+A shortcut or a bind that opens the card recording, a level meter, and
+editing the transcript before it is asked.
+
+Added after the first version: the mic is disabled while the model in
+use reports no `audio` in `input_modalities`. `AssistantModule` keeps
+each router model's inputs and reads `/models` on every canvas open;
+the model in use is the one loading, else the first not unloaded (the
+daemon's rule). Unknown inputs or a router that is down leave it
+enabled, and the daemon's error covers the rest.
 
 ## Testing