diff --git a/src/cli.ts b/src/cli.ts
index 27ec9b77e..5187a5210 100644
--- a/src/cli.ts
+++ b/src/cli.ts
@@ -964,6 +964,22 @@ exitIfManagedResourcesAreNewer(agentDir);
 initResources(agentDir);
 markStartup("initResources");
 
+// Warm the sift index in the background so it's ready when needed.
+try {
+	const { ensureSiftIndexWarmup } = await import(
+		"./resources/extensions/sf/code-intelligence.js"
+	);
+	const { loadEffectiveSFPreferences } = await import(
+		"./resources/extensions/sf/preferences.js"
+	);
+	ensureSiftIndexWarmup(
+		process.cwd(),
+		loadEffectiveSFPreferences()?.preferences?.codebase,
+	);
+} catch {
+	/* non-fatal — sift warmup is best-effort */
+}
+
 // Overlap resource loading with session manager setup — both are independent.
 // resourceLoader.reload() is the most expensive step (jiti compilation), so
 // starting it early shaves ~50-200ms off interactive startup.
diff --git a/src/resources/extensions/sf/extension-manifest.json b/src/resources/extensions/sf/extension-manifest.json
index ff736dc5c..dccc76155 100644
--- a/src/resources/extensions/sf/extension-manifest.json
+++ b/src/resources/extensions/sf/extension-manifest.json
@@ -54,6 +54,7 @@
 			"codebase",
 			"config",
 			"control",
+			"cost",
 			"debug",
 			"discuss",
 			"dispatch",
@@ -69,6 +70,7 @@
 			"help",
 			"history",
 			"hooks",
+			"implement",
 			"init",
 			"inspect",
 			"keys",
@@ -92,6 +94,7 @@
 			"quick",
 			"rate",
 			"remote",
+			"research",
 			"reset-slice",
 			"rethink",
 			"repair",
@@ -113,6 +116,7 @@
 			"tasks",
 			"templates",
 			"todo",
+			"trajectory",
 			"triage",
 			"permission-profile",
 			"undo",
diff --git a/src/resources/extensions/sf/sf-db.js b/src/resources/extensions/sf/sf-db.js
index d16bf8631..ce31d4248 100644
--- a/src/resources/extensions/sf/sf-db.js
+++ b/src/resources/extensions/sf/sf-db.js
@@ -2557,7 +2557,7 @@ function migrateSchema(db) {
 					findings TEXT NOT NULL DEFAULT '',
 					started_at TEXT,
 					completed_at TEXT,
-					created_at TEXT NOT NULL DEFAULT (datetime('now')),
+					created_at TEXT NOT NULL,
 					superseded_by TEXT,
 					FOREIGN KEY (milestone_id) REFERENCES milestones(id)
 				)
@@ -2570,18 +2570,13 @@ function migrateSchema(db) {
 				CREATE VIEW IF NOT EXISTS latest_validation_state AS
 				SELECT vr.*
 				FROM validation_runs vr
-				INNER JOIN (
-					SELECT milestone_id,
-					       COALESCE(slice_id, '') AS slice_id,
-					       COALESCE(task_id, '') AS task_id,
-					       MAX(created_at) AS max_created
-					FROM validation_runs
-					GROUP BY milestone_id, slice_id, task_id
-				) latest
-				ON vr.milestone_id = latest.milestone_id
-					AND COALESCE(vr.slice_id, '') = latest.slice_id
-					AND COALESCE(vr.task_id, '') = latest.task_id
-					AND vr.created_at = latest.max_created
+				WHERE vr.rowid = (
+					SELECT MAX(v2.rowid)
+					FROM validation_runs v2
+					WHERE v2.milestone_id = vr.milestone_id
+					  AND v2.slice_id IS vr.slice_id
+					  AND v2.task_id IS vr.task_id
+				)
 			`);
 			db.prepare(
 				"INSERT INTO schema_version (version, applied_at) VALUES (:version, :applied_at)",
@@ -7283,8 +7278,8 @@ export function startValidationRun({ milestoneId, sliceId, taskId, contract }) {
 	currentDb
 		.prepare(
 			`INSERT INTO validation_runs
-			 (run_id, milestone_id, slice_id, task_id, contract, status, started_at)
-			 VALUES (:run_id, :milestone_id, :slice_id, :task_id, :contract, 'running', datetime('now'))`,
+			 (run_id, milestone_id, slice_id, task_id, contract, status, started_at, created_at)
+			 VALUES (:run_id, :milestone_id, :slice_id, :task_id, :contract, 'running', datetime('now'), datetime('now'))`,
 		)
 		.run({
 			":run_id": runId,
@@ -7340,9 +7335,9 @@ export function getLatestValidationState(milestoneId, sliceId, taskId) {
 		.prepare(
 			`SELECT * FROM validation_runs
 			 WHERE milestone_id = :milestone_id
-			   AND (:slice_id IS NULL OR slice_id = :slice_id)
-			   AND (:task_id IS NULL OR task_id = :task_id)
-			 ORDER BY created_at DESC
+			   AND (slice_id = :slice_id OR (slice_id IS NULL AND :slice_id IS NULL))
+			   AND (task_id = :task_id OR (task_id IS NULL AND :task_id IS NULL))
+			 ORDER BY created_at DESC, run_id DESC
 			 LIMIT 1`,
 		)
 		.all({
@@ -7365,9 +7360,9 @@ export function getValidationHistory(milestoneId, sliceId, taskId, limit = 20) {
 		.prepare(
 			`SELECT * FROM validation_runs
 			 WHERE milestone_id = :milestone_id
-			   AND (:slice_id IS NULL OR slice_id = :slice_id)
-			   AND (:task_id IS NULL OR task_id = :task_id)
-			 ORDER BY created_at DESC
+			   AND (slice_id = :slice_id OR (slice_id IS NULL AND :slice_id IS NULL))
+			   AND (task_id = :task_id OR (task_id IS NULL AND :task_id IS NULL))
+			 ORDER BY created_at DESC, run_id DESC
 			 LIMIT :limit`,
 		)
 		.all({