Pi-Vis v0.4.2

Highlights

Improved responsiveness for large sessions and busy workspaces:
- Session history now loads in pages instead of eagerly rendering the entire transcript.
- Session discovery and metadata loading are faster and more parallelized.
- High-volume pi events are batched to reduce renderer churn.
- Large diffs render incrementally with “Show next … rows” controls.
Improved prompt, steer, and retry status handling:
- Prompts in flight now keep sessions in a working state without faking streaming.
- Follow-up submits while work is active route more reliably as steers.
- Queued steering/follow-up messages are shown separately until pi confirms them.
- Auto-retry status is tracked more accurately so sessions remain busy while retrying.
Fixed slash-command and custom UI edge cases:
- Unknown slash commands no longer create misleading optimistic user bubbles.
- Slash commands that open extension/custom UI no longer look like normal text prompts.
- Failed prompt/steer sends restore the composer draft instead of silently clearing it.

Moved the custom-view resize handle to a dedicated dock gutter so it no longer steals clicks from custom panel controls.
Added a visible resize affordance for custom views, with double-click reset.
Fixed collapsed-sidebar diff/tree overlays leaving thin unblurred strips at the top or bottom of the window.
Refreshed context stats immediately after model changes so the context meter updates sooner.
Made thinking-level changes more robust when pi clamps unsupported values.
Optimistically updates session names after /name for more responsive UI feedback.
Improved markdown rendering performance during streaming.
Improved JSONL parsing performance for large or chunked messages.

Public releases now require curated release notes via --notes-file or explicit --generate-notes.
Added release-note documentation under docs/releases/.