feat: Obsidian vault adapter with auto-init (#9)

* feat: Obsidian vault adapter for frame serialization

- ObsidianVaultAdapter: writes frames as .md files with YAML frontmatter
  and [[wiki-links]] into a configured Obsidian vault path
- Auto-maintained index.md with frame type counts and recent frame links
- Web clipper ingest: watches raw/ for new .md files, parses frontmatter,
  triggers ingest callback for frame creation
- Session summaries with frame backlinks
- Config: add optional `obsidian.vaultPath` to StackMemoryConfig
- Hooks into frameLifecycleHooks (onFrameCreated/onFrameClosed)
- Zero Obsidian plugins required — pure file I/O

* feat(obsidian): auto-initialize vault adapter from config

Wire ObsidianVaultAdapter into both CLI and MCP server startup:
- Reads obsidian.vaultPath from .stackmemory/config.yaml
- Auto-initializes on session start (CLI) and MCP server init
- Singleton pattern — safe to call multiple times
- Config passthrough in config-manager.ts

Usage: add to .stackmemory/config.yaml:
  obsidian:
    vaultPath: /path/to/vault

---------

Co-authored-by: StackMemory Bot (CLI) <bot@stackmemory.ai>

Author: jonathanpeterwu

src/cli/index.ts

@@ -262,6 +262,11 @@ program
         await sessionManager.initialize();
         await sharedContextLayer.initialize();
 
+        // Auto-init Obsidian vault adapter if configured
+        const { initObsidianVault } =
+          await import('../core/storage/obsidian-vault-adapter.js');
+        await initObsidianVault();
+
         const session = await sessionManager.getOrCreateSession({
           projectPath: projectRoot,
           sessionId: options.session,

src/core/config/config-manager.ts

@@ -98,6 +98,7 @@ export class ConfigManager {
       performance: { ...DEFAULT_CONFIG.performance, ...loaded.performance },
       enrichment: { ...DEFAULT_ENRICHMENT, ...loaded.enrichment },
       profiles: { ...PRESET_PROFILES, ...loaded.profiles },
+      obsidian: loaded.obsidian,
     };
 
     // Apply active profile if specified

src/core/config/types.ts

@@ -66,6 +66,17 @@ export interface ProfileConfig {
   performance?: Partial<PerformanceConfig>;
 }
 
+export interface ObsidianConfig {
+  /** Path to Obsidian vault root directory */
+  vaultPath: string;
+  /** Subdirectory within vault for StackMemory data (default: "stackmemory") */
+  subdir?: string;
+  /** Watch raw/ for web clipper input (default: true) */
+  watchRaw?: boolean;
+  /** Auto-update index.md on frame changes (default: true) */
+  autoIndex?: boolean;
+}
+
 export interface StackMemoryConfig {
   version: string;
   profile?: string; // Active profile name
@@ -77,6 +88,8 @@ export interface StackMemoryConfig {
   performance: PerformanceConfig;
   enrichment: EnrichmentConfig;
   profiles?: Record<string, ProfileConfig>;
+  /** Optional Obsidian vault integration */
+  obsidian?: ObsidianConfig;
 }
 
 export const DEFAULT_WEIGHTS: ScoringWeights = {