fix(memory): make SM opt-in (SM_ENABLED=true) instead of opt-out

Local SQLite is the memory system. External Singularity Memory is an
optional cross-project enhancement, not a dependency. Flip the default
so SM is disabled unless explicitly opted in via SM_ENABLED=true:
- sm-client.js: return disconnected early unless SM_ENABLED=true
- memory-store.js: only pass smConnected=true when SM_ENABLED=true
- doctor-config-checks.js: skip SM health check when not opted in
- sm-client.test.ts: update test to reflect opt-in behaviour

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/resources/extensions/sf/doctor-config-checks.js

@@ -389,9 +389,8 @@ export function checkVaultHealth(issues, _shouldFix) {
  */
 export async function checkSmHealth(issues, _shouldFix) {
 	try {
-		// Check if explicitly disabled
-		if (process.env.SM_ENABLED === "false") {
-			// Not an issue — explicit opt-out
+		// SM is opt-in — only check when explicitly enabled
+		if (process.env.SM_ENABLED !== "true") {
 			return;
 		}
 

src/resources/extensions/sf/memory-store.js

@@ -124,8 +124,8 @@ export async function getRelevantMemoriesRanked(query, limit = 10) {
 	let crossProjectMemories = [];
 	try {
 		const smResults = await querySmMemories(query, {
-			limit: Math.max(3, Math.ceil(limit * 0.3)), // Cross-project recall is 30% of local limit
-			smConnected: process.env.SM_ENABLED !== "false",
+			limit: Math.max(3, Math.ceil(limit * 0.3)),
+			smConnected: process.env.SM_ENABLED === "true",
 		});
 		// Convert SM results to local format (all cross-project memories tagged as such)
 		crossProjectMemories = (smResults || []).map((m) => ({

src/resources/extensions/sf/sm-client.js

@@ -18,15 +18,15 @@
  * Returns { connected: boolean, version: string | null, error?: string }
  *
  * Tries to connect to SM at SINGULARITY_MEMORY_ADDR (default: http://localhost:8080).
- * Respects SM_ENABLED=false env var to explicitly disable.
+ * SM is opt-in: set SM_ENABLED=true to activate. Disabled by default.
  */
 export async function initializeSmClient() {
-	// Check if explicitly disabled
-	if (process.env.SM_ENABLED === "false") {
+	// SM is opt-in — disabled unless explicitly enabled
+	if (process.env.SM_ENABLED !== "true") {
 		return {
 			connected: false,
 			version: null,
-			reason: "disabled via SM_ENABLED=false",
+			reason: "disabled (set SM_ENABLED=true to enable)",
 		};
 	}
 
@@ -161,10 +161,10 @@ export async function querySmMemories(query, opts = {}) {
  * Get SM client status for doctor checks.
  */
 export function getSmStatus() {
-	if (process.env.SM_ENABLED === "false") {
+	if (process.env.SM_ENABLED !== "true") {
 		return {
 			connected: false,
-			reason: "disabled via SM_ENABLED=false",
+			reason: "disabled (set SM_ENABLED=true to enable)",
 		};
 	}
 

src/resources/extensions/sf/tests/sm-client.test.ts

@@ -197,7 +197,7 @@ describe("SM Client", () => {
 
 	describe("getSmStatus", () => {
 		it("when_sm_disabled_returns_disconnected_status", async () => {
-			process.env.SM_ENABLED = "false";
+			delete process.env.SM_ENABLED; // SM is opt-in — absence means disabled
 
 			const { getSmStatus } = await import("../sm-client.js");
 
@@ -205,7 +205,7 @@ describe("SM Client", () => {
 
 			expect(status).toEqual({
 				connected: false,
-				reason: "disabled via SM_ENABLED=false",
+				reason: "disabled (set SM_ENABLED=true to enable)",
 			});
 		});