diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ff212d..8e29246 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ All notable Hermes Mobile source changes are recorded here. Entries are added du
 ## Unreleased
 
 ### Added
+- Added a fake-data Compose chat proving ground with local session rail/list, context controls, keyboard-safe composer, send/cancel/retry, and seeded empty/loading/reconnecting/error states.
+- Added typed user, assistant, system, error, and streaming chat models; selectable markdown-friendly text, copyable horizontally scrollable code blocks, expandable tool results, and reducer unit tests.
 - Added a Compose design-system package with color, semantic status, spacing, typography, shape, elevation, and motion tokens.
 - Added light and dark Hermes Compose themes backed by Material 3 color schemes.
 - Added Compose previews for small phone, normal phone, tablet width, light theme, and dark theme component coverage.
@@ -23,6 +25,7 @@ All notable Hermes Mobile source changes are recorded here. Entries are added du
 
 ### Verification
 - `git diff --check` — passed
+- `GRADLE_USER_HOME=/root/hermes-mobile/.gradle-user ./gradlew :app:testDebugUnitTest :app:assembleDebug` from `apps/mobile/android` — passed
 - `GRADLE_USER_HOME=/root/hermes-mobile/.gradle-user ./gradlew :app:assembleDebug` from `apps/mobile/android` — passed
 - `npm run typecheck --workspace @hermes-mobile/companion` — passed
 - `npm run lint --workspace @hermes-mobile/companion` — passed
diff --git a/PROJECT_PLAN.md b/PROJECT_PLAN.md
index 0561b4c..5b39a8b 100644
--- a/PROJECT_PLAN.md
+++ b/PROJECT_PLAN.md
@@ -22,12 +22,7 @@
 
 ## Now — finish the foundation already in progress
 
-- [ ] **F2 — Polished fake-data chat proving ground**
-  - Session rail/list, conversation screen, context controls, keyboard-safe composer, send/cancel/retry behavior.
-  - Render assistant/user/system/error/streaming messages from UI models.
-  - Add markdown-friendly surfaces, selectable long text, code blocks with horizontal scroll + copy, compact expandable tool results.
-  - Cover empty/loading/reconnecting/error states without clipped/overlapping content.
-  - Verification: focused UI tests where practical; Android debug build.
+_Foundation milestones complete. Continue with B1._
 
 ## Beta path — upstream-connected MVP
 
@@ -98,6 +93,12 @@ _Move finished items here with date, commit, and verification. Keep this section
   - Added Compose previews for small phone, normal phone, tablet width, light theme, and dark theme component coverage.
   - Verification: `git diff --check` passed; `GRADLE_USER_HOME=/root/hermes-mobile/.gradle-user ./gradlew :app:assembleDebug` from `apps/mobile/android` passed.
 
+- [x] **F2 — Polished fake-data chat proving ground** — 2026-07-24, commit `f65d4ac` (`feat: add fake chat proving ground`).
+  - Added a local fake chat inbox with session rail/list, context controls, keyboard-safe composer, and send/cancel/retry interactions.
+  - Added typed user, assistant, system, error, and streaming message models; selectable markdown-friendly text, horizontally scrollable copyable code, and expandable tool results.
+  - Added seeded empty, loading, reconnecting, and error states plus reducer tests for send, cancel, retry, and tool expansion.
+  - Verification: `git diff --check` passed; `GRADLE_USER_HOME=/root/hermes-mobile/.gradle-user ./gradlew :app:testDebugUnitTest :app:assembleDebug` from `apps/mobile/android` passed.
+
 ## Work-loop checklist
 
 Before coding: