Merge branch 'main' into dev

# Conflicts:
#	packages/agent/CHANGELOG.md
#	packages/ai/scripts/generate-models.ts
#	packages/ai/src/providers/cloudflare-ai-gateway.ts
#	packages/ai/test/zai-coding-plan-models.test.ts
#	packages/coding-agent/src/modes/interactive/interactive-mode.ts
#	packages/tui/src/tui-alt-screen.ts

packages/coding-agent/CHANGELOG.md

@@ -2,6 +2,23 @@
 
 ## [Unreleased]
 
+### Added
+
+- Added `ui_prompt_start` and `ui_prompt_end` extension events so host integrations can distinguish active agent work from waiting on user-facing `ctx.ui` prompts ([#5329](https://github.com/earendil-works/pi/issues/5329)).
+- Added transcript usage notices for compaction and branch summaries when cache miss notices are enabled.
+- Added RPC `clear_queue` to retrieve and remove queued steering and follow-up messages ([#8432](https://github.com/earendil-works/pi/issues/8432)).
+- Added environment variables and advanced settings for overriding auto-detected terminal hyperlink, image, and truecolor capabilities ([#8665](https://github.com/earendil-works/pi/issues/8665)).
+- Added `fullscreenCopyOnSelect` to disable automatic fullscreen selection copy; when disabled, `Ctrl+X` copies the active text selection before falling back to the last assistant message, while `/tree` still copies the selected message ([#7720](https://github.com/earendil-works/pi/issues/7720)).
+
+### Fixed
+
+- Fixed toggling thinking visibility clearing partial output from running Bash tools ([#8611](https://github.com/earendil-works/pi/issues/8611)).
+- Fixed Windows shell aborts crashing Pi when `taskkill.exe` is unavailable on `PATH` ([#6596](https://github.com/earendil-works/pi/issues/6596)).
+- Fixed resumed sessions corrupting the next appended entry when their JSONL file lacks a trailing newline ([#8345](https://github.com/earendil-works/pi/issues/8345)).
+- Fixed extension messages sent with `triggerTurn: false` while the agent is running being inserted between a tool call and its result, which made providers that validate message order reject the replayed history. They are now appended once the turn's tool results are in ([#8537](https://github.com/earendil-works/pi/issues/8537)).
+- Fixed compaction and branch summaries forcing `toolChoice: "none"` ([#8649](https://github.com/earendil-works/pi/issues/8649), [#8638](https://github.com/earendil-works/pi/issues/8638)).
+- Fixed Google Vertex requests failing with `HttpsProxyAgent is not a constructor` when the bundled Node.js runtime uses an HTTP(S) proxy ([#8610](https://github.com/earendil-works/pi/issues/8610)).
+
 ## [0.84.3] - 2026-08-24
 
 ### New Features