Add thesis status column for two-phase commit lifecycle tracking

app/migrations/applied/039_add_thesis_status.sql

@@ -0,0 +1,14 @@
+-- 039: Add a status column to theses to track submission lifecycle
+--
+-- Lifecycle:
+--   draft  — thesis row created, file operations not yet completed (or failed)
+--   active — all file operations succeeded, submission is complete
+--
+-- Separate from is_published (visibility).  The admin can filter drafts
+-- to find orphaned/broken submissions and the cleanup-drafts job targets
+-- status='draft' rows older than a threshold.
+
+ALTER TABLE theses ADD COLUMN status TEXT NOT NULL DEFAULT 'active';
+
+-- Existing theses already have files → they are active.
+-- New theses start as draft and are promoted to active after file ops succeed.