fix(bridge): dev data dir is 'obsidian-rag' not '.obsidian-rag'

Python's _resolve_data_dir() uses 'obsidian-rag' (no dot).
TypeScript was using '.obsidian-rag' (with dot) — mismatch caused
sync-result.json to never be found by the agent plugin.

src/services/health.ts

@@ -123,7 +123,7 @@ export async function probeAll(config: ObsidianRagConfig): Promise<ProbeResult>
 
 function resolveDataDir(): string {
   const cwd = process.cwd();
-  const devDataDir = resolve(cwd, ".obsidian-rag");
+  const devDataDir = resolve(cwd, "obsidian-rag");
   const devVaultMarker = resolve(cwd, "KnowledgeVault");
   if (existsSync(devDataDir) || existsSync(devVaultMarker)) {
     return devDataDir;

src/services/indexer-bridge.ts

@@ -121,7 +121,7 @@ export function readSyncResult(config: ObsidianRagConfig): {
 
 function _resolveDataDir(): string {
   const cwd = process.cwd();
-  const devDataDir = resolve(cwd, ".obsidian-rag");
+  const devDataDir = resolve(cwd, "obsidian-rag");
   const devVaultMarker = resolve(cwd, "KnowledgeVault");
   if (existsSync(devDataDir) || existsSync(devVaultMarker)) {
     return devDataDir;