docs: rename test_sprint21 to test_sprint20b, update test counts to 415

Sprint 20 combines voice input (20a) and send button polish (20b).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

CHANGELOG.md

@@ -6,7 +6,7 @@
 ---
 
 ## [v0.22] Sprint 20 -- Voice Input + Send Button Polish
-*April 3, 2026 | 382 tests*
+*April 3, 2026 | 415 tests*
 
 ### Features
 - **Voice input via Web Speech API.** Microphone button in the composer.
@@ -39,7 +39,9 @@
 
 ### Tests
 - 52 new tests in `test_sprint20.py`: voice input HTML, CSS, JS, append
-  behaviour, error handling, regressions. Total: **382 tests**.
+  behaviour, error handling, regressions.
+- 33 new tests in `test_sprint20b.py`: send button HTML, CSS, JS,
+  animation, visibility logic, regressions. Total: **415 tests**.
 
 ---
 
@@ -714,4 +716,4 @@ Three-panel layout: sessions sidebar, chat area, workspace panel.
 
 ---
 
-*Last updated: v0.22, April 3, 2026 | Tests: 382*
+*Last updated: v0.22, April 3, 2026 | Tests: 415*

SPRINTS.md

@@ -1,6 +1,6 @@
 # Hermes Web UI -- Forward Sprint Plan
 
-> Current state: v0.22 | 382 tests | Daily driver ready
+> Current state: v0.22 | 415 tests | Daily driver ready
 > This document plans the path from here to two targets:
 >
 > Target A: 1:1 feature parity with the Hermes CLI (everything you can do from the
@@ -415,7 +415,7 @@ UX was a low-effort high-impact polish opportunity that pairs naturally.
 - Voice input IIFE in `boot.js` with SpeechRecognition lifecycle.
 - `updateSendBtn()` in `ui.js` hooked into setBusy, renderTray, autoResize.
 
-**Tests:** 52 new (voice) + 33 new (send button). Total: 413.
+**Tests:** 52 new (voice) + 33 new (send button). Total: 415.
 **Hermes CLI parity impact:** Medium (voice not in CLI, but adds capability)
 **Claude parity impact:** High (Claude has native voice mode)
 
@@ -540,5 +540,5 @@ UX was a low-effort high-impact polish opportunity that pairs naturally.
 ---
 
 *Last updated: April 3, 2026*
-*Current version: v0.22 | 382 tests*
+*Current version: v0.22 | 415 tests*
 *Next sprint: Sprint 21 (Mobile Responsive)*