chore: sync upstream/main 17 commits (2026-09-04) — merged

Upstream sync completed

PR: #54
Branch: sync/fork-sync-resolution-2026-09-04
Resolution: Manual conflict resolution on 7 files

File	Resolution
apps/kimi-code/src/tui/commands/config.ts	Preserved fork-owned fallback-model and squeeze-model commands
apps/kimi-code/src/tui/config.ts	Kept fork-owned config additions
apps/kimi-code/test/tui/commands/update-preferences.test.ts	Merged fork test expectations with upstream
apps/kimi-code/test/tui/config.test.ts	Merged fork test expectations with upstream
packages/agent-core-v2/src/agent/fullCompaction/compactionOps.ts	Kept fork-owned fullCompactionKey model fields
packages/agent-core-v2/src/agent/fullCompaction/fullCompactionService.ts	Merged upstream imports with fork squeeze-model cascade
packages/agent-core-v2/src/app/telemetry/events.ts	Merged telemetry event definitions

Removed stale fullCompactionWireRangesKey import from test/state/builtinReplayableKeys.ts (state key deleted by upstream refactor)

All markers in .github/FORK_OWNED_FILES present after merge.