v0.39.0

## What's Changed
* refactor(plan): simplify policy priorities and consolidate read-only rules by @ruomengz in https://github.com/google-gemini/gemini-cli/pull/24849
* feat(test-utils): add memory usage integration test harness by @sripasg in https://github.com/google-gemini/gemini-cli/pull/24876
* feat(memory): add /memory inbox command for reviewing extracted skills by @SandyTao520 in https://github.com/google-gemini/gemini-cli/pull/24544
* chore(release): bump version to 0.39.0-nightly.20260408.e77b22e63 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/24939
* fix(core): ensure robust sandbox cleanup in all process execution paths by @ehedlund in https://github.com/google-gemini/gemini-cli/pull/24763
* chore: update ink version to 6.6.8 by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/24934
* Changelog for v0.38.0-preview.0 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/24938
* chore: ignore conductor directory by @JayadityaGit in https://github.com/google-gemini/gemini-cli/pull/22128
* Changelog for v0.37.0 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/24940
* feat(plan): require user confirmation for activate_skill in Plan Mode by @ruomengz in https://github.com/google-gemini/gemini-cli/pull/24946
* feat(test-utils): add CPU performance integration test harness by @sripasg in https://github.com/google-gemini/gemini-cli/pull/24951
* fix(cli-ui): enable Ctrl+Backspace for word deletion in Windows Terminal by @dogukanozen in https://github.com/google-gemini/gemini-cli/pull/21447
* test(sdk): add unit tests for GeminiCliSession by @AdamyaSingh7 in https://github.com/google-gemini/gemini-cli/pull/21897
* fix(core): resolve windows symlink bypass and stabilize sandbox integration tests by @ehedlund in https://github.com/google-gemini/gemini-cli/pull/24834
* fix(cli): restore file path display in edit and write tool confirmations by @jwhelangoog in https://github.com/google-gemini/gemini-cli/pull/24974
* feat(core): refine shell tool description display logic by @jwhelangoog in https://github.com/google-gemini/gemini-cli/pull/24903
* fix(core): dynamic session ID injection to resolve resume bugs by @scidomino in https://github.com/google-gemini/gemini-cli/pull/24972
* Update ink version to 6.6.9 by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/24980
* Generalize evals infra to support more types of evals, organization and queuing of named suites by @gundermanc in https://github.com/google-gemini/gemini-cli/pull/24941
* fix(cli): optimize startup with lightweight parent process by @sehoon38 in https://github.com/google-gemini/gemini-cli/pull/24667
* refactor(sandbox): use centralized sandbox paths in macOS Seatbelt implementation by @ehedlund in https://github.com/google-gemini/gemini-cli/pull/24984
* feat(cli): refine tool output formatting for compact mode by @jwhelangoog in https://github.com/google-gemini/gemini-cli/pull/24677
* fix(sdk): skip broken sendStream tests to unblock nightly by @SandyTao520 in https://github.com/google-gemini/gemini-cli/pull/25000
* refactor(core): use centralized path resolution for Linux sandbox by @ehedlund in https://github.com/google-gemini/gemini-cli/pull/24985
* Support ctrl+shift+g by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/25035
* feat(core): refactor subagent tool to unified invoke_subagent tool by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/24489
* fix(core): add explicit git identity env vars to prevent sandbox checkpointing error by @mrpmohiburrahman in https://github.com/google-gemini/gemini-cli/pull/19775
* fix: respect hideContextPercentage when FooterConfigDialog is closed without changes by @chernistry in https://github.com/google-gemini/gemini-cli/pull/24773
* fix(cli): suppress unhandled AbortError logs during request cancellation by @euxaristia in https://github.com/google-gemini/gemini-cli/pull/22621
* Automated documentation audit by @g-samroberts in https://github.com/google-gemini/gemini-cli/pull/24567
* feat(cli): implement useAgentStream hook by @mbleigh in https://github.com/google-gemini/gemini-cli/pull/24292
* refactor(plan) Clean default plan toml by @ruomengz in https://github.com/google-gemini/gemini-cli/pull/25037
* refactor(core): remove legacy subagent wrapping tools by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/25053
* fix(core): honor retryDelay in RetryInfo for 503 errors by @yunaseoul in https://github.com/google-gemini/gemini-cli/pull/25057
* fix(core): remediate subagent memory leaks using AbortSignal in MessageBus by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/25048
* feat(cli): wire up useAgentStream in AppContainer by @mbleigh in https://github.com/google-gemini/gemini-cli/pull/24297
* feat(core): migrate chat recording to JSONL streaming by @spencer426 in https://github.com/google-gemini/gemini-cli/pull/23749
* fix(core): clear 5-minute timeouts in oauth flow to prevent memory leaks by @spencer426 in https://github.com/google-gemini/gemini-cli/pull/24968
* fix(sandbox): centralize async git worktree resolution and enforce read-only security by @ehedlund in https://github.com/google-gemini/gemini-cli/pull/25040
* feat(test): add high-volume shell test and refine perf harness by @sripasg in https://github.com/google-gemini/gemini-cli/pull/24983
* fix(core): silently handle EPERM when listing dir structure by @scidomino in https://github.com/google-gemini/gemini-cli/pull/25066
* Changelog for v0.37.1 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/25055
* fix: decode Uint8Array and multi-byte UTF-8 in API error messages by @kimjune01 in https://github.com/google-gemini/gemini-cli/pull/23341
* Automated documentation audit results by @g-samroberts in https://github.com/google-gemini/gemini-cli/pull/22755
* debugging(ui): add optional debugRainbow setting by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/25088
* fix: resolve lifecycle memory leaks by cleaning up listeners and root closures by @spencer426 in https://github.com/google-gemini/gemini-cli/pull/25049
* docs(cli): updates f12 description to be more precise by @JayadityaGit in https://github.com/google-gemini/gemini-cli/pull/15816
* fix(cli): mark /settings as unsafe to run concurrently by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/25061
* fix(core): remove buffer slice to prevent OOM on large output streams by @spencer426 in https://github.com/google-gemini/gemini-cli/pull/25094
* feat(core): persist subagent agentId in tool call records by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/25092
* chore(core): increase codebase investigator turn limits to 50 by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/25125
* refactor(core): consolidate execute() arguments into ExecuteOptions by @mbleigh in https://github.com/google-gemini/gemini-cli/pull/25101
* feat(core): add Strategic Re-evaluation guidance to system prompt by @aishaneeshah in https://github.com/google-gemini/gemini-cli/pull/25062
* fix(core): preserve shell execution config fields on update by @jasonmatthewsuhari in https://github.com/google-gemini/gemini-cli/pull/25113
* docs: add vi shortcuts and clarify MCP sandbox setup by @chrisjcthomas in https://github.com/google-gemini/gemini-cli/pull/21679
* fix(cli): pass session id to interactive shell executions by @jasonmatthewsuhari in https://github.com/google-gemini/gemini-cli/pull/25114
* fix(cli): resolve text sanitization data loss due to C1 control characters by @euxaristia in https://github.com/google-gemini/gemini-cli/pull/22624
* feat(core): add large memory regression test by @cynthialong0-0 in https://github.com/google-gemini/gemini-cli/pull/25059
* fix(core): resolve PTY exhaustion and orphan MCP subprocess leaks by @spencer426 in https://github.com/google-gemini/gemini-cli/pull/25079
* chore(deps): update vulnerable dependencies via npm audit fix by @scidomino in https://github.com/google-gemini/gemini-cli/pull/25140
* perf(sandbox): optimize Windows sandbox initialization via native ACL application by @ehedlund in https://github.com/google-gemini/gemini-cli/pull/25077
* chore: switch from keytar to @github/keytar by @cocosheng-g in https://github.com/google-gemini/gemini-cli/pull/25143
* fix: improve audio MIME normalization and validation in file reads by @junaiddshaukat in https://github.com/google-gemini/gemini-cli/pull/21636
* docs: Update docs-audit to include changes in PR body by @g-samroberts in https://github.com/google-gemini/gemini-cli/pull/25153
* docs: correct documentation for enforced authentication type by @cocosheng-g in https://github.com/google-gemini/gemini-cli/pull/25142
* fix(cli): exclude update_topic from confirmation queue count by @Abhijit-2592 in https://github.com/google-gemini/gemini-cli/pull/24945
* Memory fix for trace's streamWrapper. by @anthraxmilkshake in https://github.com/google-gemini/gemini-cli/pull/25089
* fix(core): fix quota footer for non-auto models and improve display by @jackwotherspoon in https://github.com/google-gemini/gemini-cli/pull/25121
* docs(contributing): clarify self-assignment policy for issues by @jmr in https://github.com/google-gemini/gemini-cli/pull/23087
* feat(core): add skill patching support with /memory inbox integration by @SandyTao520 in https://github.com/google-gemini/gemini-cli/pull/25148
* Stop suppressing thoughts and text in model response by @gundermanc in https://github.com/google-gemini/gemini-cli/pull/25073
* fix(release): prefix git hash in nightly versions to prevent semver normalization by @SandyTao520 in https://github.com/google-gemini/gemini-cli/pull/25304
* feat(cli): extract QuotaContext and resolve infinite render loop by @Adib234 in https://github.com/google-gemini/gemini-cli/pull/24959
* refactor(core): extract and centralize sandbox path utilities by @ehedlund in https://github.com/google-gemini/gemini-cli/pull/25305
* feat(ui): added enhancements to scroll momentum by @devr0306 in https://github.com/google-gemini/gemini-cli/pull/24447
* fix(core): replace custom binary detection with isbinaryfile to correctly handle UTF-8 (U+FFFD) by @Anjaligarhwal in https://github.com/google-gemini/gemini-cli/pull/25297
* feat(agent): implement tool-controlled display protocol (Steps 2-3) by @mbleigh in https://github.com/google-gemini/gemini-cli/pull/25134
* Stop showing scrollbar unless we are in terminalBuffer mode by @jacob314 in https://github.com/google-gemini/gemini-cli/pull/25320
* feat: support auth block in MCP servers config in agents by @TanmayVartak in https://github.com/google-gemini/gemini-cli/pull/24770
* fix(core): expose GEMINI_PLANS_DIR to hook environment by @Adib234 in https://github.com/google-gemini/gemini-cli/pull/25296
* feat(core): implement silent fallback for Plan Mode model routing by @jerop in https://github.com/google-gemini/gemini-cli/pull/25317
* fix: correct redirect count increment in fetchJson by @KevinZhao in https://github.com/google-gemini/gemini-cli/pull/24896
* fix(core): prevent secondary crash in ModelRouterService finally block by @gundermanc in https://github.com/google-gemini/gemini-cli/pull/25333
* feat(core): introduce decoupled ContextManager and Sidecar architecture by @joshualitt in https://github.com/google-gemini/gemini-cli/pull/24752
* docs(core): update generalist agent documentation by @abhipatel12 in https://github.com/google-gemini/gemini-cli/pull/25325
* chore(mcp): check MCP error code over brittle string match by @jackwotherspoon in https://github.com/google-gemini/gemini-cli/pull/25381
* feat(plan): update plan mode prompt to allow showing plan content by @ruomengz in https://github.com/google-gemini/gemini-cli/pull/25058
* test(core): improve sandbox integration test coverage and fix OS-specific failures by @ehedlund in https://github.com/google-gemini/gemini-cli/pull/25307
* fix(core): use debug level for keychain fallback logging by @ehedlund in https://github.com/google-gemini/gemini-cli/pull/25398
* feat(test): add a performance test in asian language by @cynthialong0-0 in https://github.com/google-gemini/gemini-cli/pull/25392
* feat(cli): enable mouse clicking for cursor positioning in AskUser multi-line answers by @Adib234 in https://github.com/google-gemini/gemini-cli/pull/24630
* fix(core): detect kmscon terminal as supporting true color by @claygeo in https://github.com/google-gemini/gemini-cli/pull/25282
* ci: add agent session drift check workflow by @adamfweidman in https://github.com/google-gemini/gemini-cli/pull/25389
* use macos-latest-large runner where applicable. by @scidomino in https://github.com/google-gemini/gemini-cli/pull/25413
* Changelog for v0.37.2 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/25336
* fix(patch): cherry-pick a4e98c0 to release/v0.39.0-preview.0-pr-25138 to patch version v0.39.0-preview.0 and create version 0.39.0-preview.1 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/25766
* fix(patch): cherry-pick d6f88f8 to release/v0.39.0-preview.1-pr-25670 to patch version v0.39.0-preview.1 and create version 0.39.0-preview.2 by @gemini-cli-robot in https://github.com/google-gemini/gemini-cli/pull/25776

## New Contributors
* @dogukanozen made their first contribution in https://github.com/google-gemini/gemini-cli/pull/21447
* @AdamyaSingh7 made their first contribution in https://github.com/google-gemini/gemini-cli/pull/21897
* @chernistry made their first contribution in https://github.com/google-gemini/gemini-cli/pull/24773
* @kimjune01 made their first contribution in https://github.com/google-gemini/gemini-cli/pull/23341
* @anthraxmilkshake made their first contribution in https://github.com/google-gemini/gemini-cli/pull/25089
* @jmr made their first contribution in https://github.com/google-gemini/gemini-cli/pull/23087
* @TanmayVartak made their first contribution in https://github.com/google-gemini/gemini-cli/pull/24770
* @KevinZhao made their first contribution in https://github.com/google-gemini/gemini-cli/pull/24896
* @claygeo made their first contribution in https://github.com/google-gemini/gemini-cli/pull/25282

**Full Changelog**: https://github.com/google-gemini/gemini-cli/compare/v0.38.2...v0.39.0