Add --exclude, detect/inspect_bundle tools, Spring/test entry-point detection

- Global `--exclude <glob>` (repeatable) on search symbols/text and
  find dead/dead-symbols, with built-in defaults (vendor/, node_modules/,
  *.min.*, dist/, build/). Minified/vendored assets stay indexed for import
  edges but are filtered from query results (bootstrap.min.css noise: 90% of
  dead symbols -> gone).
- `detect` CLI / `codebase_detect` MCP tool: probe a directory's languages and
  stack from file extensions and manifest files before indexing.
- `inspect bundle` CLI / `inspect_bundle` MCP tool: symbol source + direct
  callers + direct importers in one call (3 round-trips -> 1).
- find dead-symbols: skip CSS files and structural kinds (package, heading*)
  as non-callable; extend framework-wired detection with JUnit/Spring
  annotations (@Test, @Service, @Component, ...) and pytest/JUnit test-class
  naming (Test*, test_*, *Test, *Tests), plus `test_` methods reported as
  `member` kind.
- README: correct CSS statement, document new tools/limits.

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

Cargo.lock

@@ -399,6 +399,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "clap",
+ "globset",
  "ignore",
  "rayon",
  "regex",