feat(config): Phase 2 Configurable Output — vestige.toml + output profiles (v2.1.24)

Add an optional, local-first `vestige.toml` config file (loaded from the active
data directory alongside vestige.db) that lets users control the default shape
and size of high-traffic MCP responses without recompiling and without a cloud
service.

- New `vestige-core::config` module: `VestigeConfig` / `OutputConfig` /
  `OutputProfile` with a dependency-free, lenient minimal-TOML parser for the
  `[defaults]` table (detail_level, limit, profile).
- Output profiles: lean | default | audit | research. `default` reproduces
  pre-2.1.24 behavior byte-for-byte so existing users see no change.
- Precedence (per call): explicit MCP param > config file > built-in default.
- Wired into search, memory_timeline, codebase (get_context), session_context.
  Each echoes the active `profile`; `lean` masks scores/timestamps via a shared
  `apply_output_masks` helper.
- McpServer loads config once at construction from storage.data_dir().
- Tests: config precedence/profile unit tests in core (10) + per-tool precedence
  and lean-masking tests. Full workspace suite green, clippy -D warnings clean,
  dashboard check + build green.
- Docs: new "Output Configuration (vestige.toml)" section in docs/CONFIGURATION.md
  and CHANGELOG 2.1.24 entry. Version bumped 2.1.23 -> 2.1.24.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

server.json

@@ -7,12 +7,12 @@
     "url": "https://github.com/samvallad33/vestige",
     "source": "github"
   },
-  "version": "2.1.23",
+  "version": "2.1.24",
   "packages": [
     {
       "registryType": "npm",
       "identifier": "vestige-mcp-server",
-      "version": "2.1.23",
+      "version": "2.1.24",
       "transport": {
         "type": "stdio"
       }