* fix: strip model variant suffix for all auth methods, not just OAuth (#1097)
The model ID variant suffix (e.g., `[1m]` in `claude-opus-4-6[1m]`) was
only stripped for OAuth token auth. When using an API key, the suffix was
sent to the Anthropic API as-is, causing a 400 "upstream_error" because
`claude-opus-4-6[1m]` is not a valid API model ID.
The default Anthropic model is `claude-opus-4-6[1m]` (1M context variant),
so every API key user hits this on every request.
Fix: strip `[...]` suffix unconditionally for all auth methods.
* fix: update source-reading tests for post-refactor file locations
triage-dispatch.test.ts: read auto-post-unit.ts (dispatch logic moved
from auto.ts) and update comment string matches to reflect renamed
section headers.
token-profile.test.ts: read preferences-types.ts, preferences-validation.ts,
and preferences-models.ts (GSDPreferences interface and validation logic
split from preferences.ts).
155c32e01b