feat(CF-762): Complete Jira migration - consolidate projects, cleanup

- Remove task CRUD/epic/search/relation/version tools (moved to Jira)
- Add migration scripts: migrate-tasks-to-jira, jira-admin, prepare-all-projects
- Add consolidate-projects.ts for merging duplicate Jira projects
- Add validate-migration.ts for post-migration integrity checks
- Add jira_issue_key columns migration (030)
- Consolidate 11 duplicate projects (LIT→LITE, CARD→CS, etc.)
- Delete 92 placeholder issues, 11 empty source projects
- Remove SG project completely
- 2,798 tasks migrated across 46 Jira projects

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

migrations/028_session_checkpoint_index.sql

@@ -0,0 +1,7 @@
+-- Migration 028: Add unique index for session checkpoint upserts (CF-572)
+-- Ensures at most ONE checkpoint row per session+note_type.
+-- Normal session_note_add calls (recovered_from IS NULL) are unaffected.
+
+CREATE UNIQUE INDEX IF NOT EXISTS uq_session_checkpoint
+  ON session_notes (session_id, note_type)
+  WHERE recovered_from = 'checkpoint';

migrations/030_add_jira_issue_key.sql

@@ -0,0 +1,9 @@
+-- Migration 030: Add jira_issue_key to sessions for Jira Cloud linking (CF-762)
+-- Links sessions to Jira issues after task management moved to Jira Cloud
+
+ALTER TABLE sessions ADD COLUMN IF NOT EXISTS jira_issue_key TEXT;
+
+CREATE INDEX IF NOT EXISTS idx_sessions_jira_issue_key ON sessions (jira_issue_key) WHERE jira_issue_key IS NOT NULL;
+
+-- Also add to task_activity for historical audit trail linking
+ALTER TABLE task_activity ADD COLUMN IF NOT EXISTS jira_issue_key TEXT;