docs: close out MS19 Chat & Terminal System mission (#523)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

docs/scratchpads/ms19-chat-terminal-20260225.md

@@ -86,3 +86,34 @@ MS18 is complete. Coolify deprecated, Portainer migration in progress with anoth
 - Created TASKS.md with 12-task breakdown (~250K token estimate)
 - Created this scratchpad
 - Archived MS18 TASKS.md to docs/tasks/MS18-ThemeWidgets-tasks.md
+
+### S2 — 2026-02-25
+
+- Fixed CSRF token issue affecting API route health checks
+- Wave 1 dispatch: CT-TERM-001 (terminal gateway) + CT-CHAT-001 (chat streaming) in parallel sonnet workers
+- CT-TERM-001 → PR #515 merged (6290fc3), 48 tests
+- CT-CHAT-001 → PR #516 merged (7de0e73), streaming + fallback + abort
+- Wave 2 dispatch: CT-TERM-002 (persistence) + CT-TERM-003 (xterm.js) in parallel sonnet workers
+- CT-TERM-002 → PR #517 merged (8128eb7), 12 tests, #508 closed
+- CT-TERM-003 → PR #518 merged (417c6ab), 40 tests
+- Context exhaustion after 5 tasks
+
+### S3 — 2026-02-25
+
+- Resume: Re-applied lost S2 TASKS.md edits (git stash during S2 cleanup lost docs)
+- Wave 3a dispatch: CT-TERM-004 + CT-CHAT-002 in parallel sonnet workers
+- CT-CHAT-002 → PR #519 merged (13aa52a), 46 tests, #510 closed
+- CT-TERM-004 → PR #520 merged (859dcfc), 76 tests, #509 closed
+- Wave 3b dispatch: CT-ORCH-001 (orchestrator chat) as sonnet worker
+- CT-ORCH-001 → PR #521 merged (b110c46), 34 tests
+- Wave 4 dispatch: CT-ORCH-002 (agent terminal) as sonnet worker
+- CT-ORCH-002 worker completed with 79 tests, commit a0ceb30
+- Context exhaustion before processing ORCH-002 output
+
+### S4 — 2026-02-26
+
+- Resume: Processed CT-ORCH-002 worker output from S3
+- Cherry-picked a0ceb30 → clean branch → PR #522 merged (9b2520c), #511 closed
+- CT-VER-001 verified: 328 MS19 tests (268 web + 60 API) across 15 test files, all passing
+- CT-DOC-001: Updated TASKS.md, MISSION-MANIFEST.md, PRD.md, scratchpad
+- Remaining: CT-VER-002 (deploy + smoke test)