Handle defensive ALTER TABLE defects in migrations (#488)

The defensive ADD COLUMN statements in migrations 020, 025, and 027
use Effect.catch to swallow "duplicate column" errors on re-runs, but
@effect/sql-sqlite-bun throws from db.query() outside its try/catch,
so the SQLiteError surfaces as an Effect defect rather than a failure.
Effect.catch only handles failures, so migration 27 crashed on fresh
databases because migration 25 had already added default_model_selection.

Switch to Effect.catchCause so both failures and defects are absorbed.

Author: jbrahy

apps/server/src/persistence/Migrations/020_SmeConversationProviderAuth.ts

@@ -7,12 +7,12 @@ export default Effect.gen(function* () {
   yield* sql`
     ALTER TABLE sme_conversations
     ADD COLUMN provider TEXT NOT NULL DEFAULT 'claudeAgent'
-  `.pipe(Effect.catch(() => Effect.void));
+  `.pipe(Effect.catchCause(() => Effect.void));
 
   yield* sql`
     ALTER TABLE sme_conversations
     ADD COLUMN auth_method TEXT NOT NULL DEFAULT 'auto'
-  `.pipe(Effect.catch(() => Effect.void));
+  `.pipe(Effect.catchCause(() => Effect.void));
 
   yield* sql`
     UPDATE sme_conversations

apps/server/src/persistence/Migrations/025_CanonicalizeModelSelections.ts

@@ -7,12 +7,12 @@ export default Effect.gen(function* () {
   yield* sql`
     ALTER TABLE projection_projects
     ADD COLUMN default_model_selection TEXT
-  `.pipe(Effect.catch(() => Effect.void));
+  `.pipe(Effect.catchCause(() => Effect.void));
 
   yield* sql`
     ALTER TABLE projection_threads
     ADD COLUMN model_selection TEXT
-  `.pipe(Effect.catch(() => Effect.void));
+  `.pipe(Effect.catchCause(() => Effect.void));
 
   yield* sql`
     UPDATE projection_projects

apps/server/src/persistence/Migrations/025_ProjectionProjectIconPath.ts

@@ -7,5 +7,5 @@ export default Effect.gen(function* () {
   yield* sql`
     ALTER TABLE projection_projects
     ADD COLUMN icon_path TEXT
-  `.pipe(Effect.catch(() => Effect.void));
+  `.pipe(Effect.catchCause(() => Effect.void));
 });

apps/server/src/persistence/Migrations/027_CanonicalizeModelSelectionsBackfill.ts

@@ -81,12 +81,12 @@ export default Effect.gen(function* () {
   yield* sql`
     ALTER TABLE projection_projects
     ADD COLUMN default_model_selection TEXT
-  `.pipe(Effect.catch(() => Effect.void));
+  `.pipe(Effect.catchCause(() => Effect.void));
 
   yield* sql`
     ALTER TABLE projection_threads
     ADD COLUMN model_selection TEXT
-  `.pipe(Effect.catch(() => Effect.void));
+  `.pipe(Effect.catchCause(() => Effect.void));
 
   const projectRows = yield* sql<ProjectRow>`
     SELECT