add vault-aware tools: list_vault_tags, check_wikilinks, search_notes

Shared read-only implementations in src/vault/noteTools.ts, exposed to
both backends: as an in-process SDK MCP server (mcp__vault__*, stripped
to plain names in SSE events) for claude-sdk, and as chat-completions
tool defs for openai-compat. Wikilink resolution follows Obsidian
semantics incl. path-links resolved relative to the linking file's
folder; tags come from frontmatter (list + array forms) and inline
#tags, excluding code fences. zod added as a direct dependency
(pinned to the SDK's transitively-resolved v4).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

package-lock.json

@@ -12,7 +12,8 @@
         "@anthropic-ai/claude-agent-sdk": "^0.3.212",
         "@koa/bodyparser": "^6.0.0",
         "@koa/router": "^14.0.0",
-        "koa": "^3.0.1"
+        "koa": "^3.0.1",
+        "zod": "^4.4.3"
       },
       "devDependencies": {
         "@types/koa": "^2.15.0",
@@ -2535,7 +2536,6 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.4.3.tgz",
       "integrity": "sha512-ytENFjIJFl2UwYglde2jchW2Hwm4GJFLDiSXWdTrJQBIN9Fcyp7n4DhxJEiWNAJMV1/BqWfW/kkg71UDcHJyTQ==",
       "license": "MIT",
-      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }