docs: restructure README and add client setup guide (#82)

* docs: restructure README and add client setup guide

README cut from 707 to ~220 lines. Per-client config blocks, pipeline
internals, and eval harness moved to dedicated docs where they belong.
Screenshots and CLI previews moved up before the setup details.

- docs/client-setup.md: new file with all 7 client configs (stdio + HTTP
  where supported), fallback single-project setup, and local build testing
- docs/capabilities.md: add practical routing examples and selection_required
  response shape (moved from README)
- CONTRIBUTING.md: add eval harness section (moved from README)
- templates/mcp/stdio/.mcp.json + http/.mcp.json: copy-pasteable config templates
- tests/mcp-client-templates.test.ts: regression tests for template validity
  and README/capabilities doc coverage
- package.json: add docs/client-setup.md to files array

* Update tests/mcp-client-templates.test.ts

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

---------

Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>

Author: PatrickSys

docs/capabilities.md

@@ -21,6 +21,7 @@ Per-project config overrides supported today:
 - `projects[].analyzerHints.analyzer`: prefers a registered analyzer by name for that project and falls back safely when the name is missing or invalid
 - `projects[].analyzerHints.extensions`: adds project-local source extensions for indexing and auto-refresh watching without changing defaults for other projects
 
+
 Copy-pasteable client config templates are shipped in the package:
 
 - `templates/mcp/stdio/.mcp.json` — stdio setup for `.mcp.json`-style clients