default prime inference to glm 5.3

[kevinjosethomas]

• use z-ai/glm-5.3 as the prime inference default for startup, fallback, and first-time login.
• update login messaging, selection coverage, and the changelog.
• validated with npm run check and 199 passing tests across four updated test files.

fixes res-1322.

---

Note

Low Risk
Configuration and messaging only; behavior is the same except for the default model id.

Overview
Bumps the Prime Inference default from GLM 5.2 (z-ai/glm-5.2) to GLM 5.3 (z-ai/glm-5.3) via PRIME_INFERENCE_DEFAULT_MODEL_ID, which drives provider defaults, startup preference when Prime is available, and post-login fallback selection.

The interactive login error text now refers to GLM 5.3 when that default cannot be applied. Tests and a changelog entry were updated to match.

^{Reviewed by Cursor Bugbot for commit fdc047b. Bugbot is set up for automated code reviews on this repo. Configure here.}

Note

Set Prime Inference default model to GLM 5.3

Updates PRIME_INFERENCE_DEFAULT_MODEL_ID in model-resolver.ts from GLM 5.2 to GLM 5.3. The post-login error message in InteractiveMode.prepareForModelSelectionAfterLogin now references GLM 5.3. All related tests and fixtures are updated to expect GLM 5.3 as the default.

• Risk: existing users with persisted model preferences are unaffected, but new Prime Inference users will now default to GLM 5.3.

^{Macroscope summarized fdc047b.}

[sethkarten]

lgtm