docs: document missing MCP tools and parameters in Readme

[param-gremlin]

Brings Readme.md's tool documentation back in sync with the tools the server actually registers in src/.

Added

Tool	Category	Notes
list_teams	New Teams section (top of Available Tools)	No params. Entry point for discovering teamId, which nearly every other tool requires.
run_reliability_test	Testing & Experiments	Requires SERVICES_RUN privilege; can return HTTP 400 if a test is already running/scheduled for the service.
get_pending_test_runs	Testing & Experiments	Params: teamId, serviceId (both required). Useful for diagnosing the above 400.
search_gremlin_api	New Direct API Access section	Searches the Gremlin OpenAPI spec for endpoints.
execute_gremlin_api	New Direct API Access section	Executes an arbitrary Gremlin API endpoint. Endpoints requiring a *_RUN privilege prompt for interactive confirmation unless bypassed via confirmExecution. Can trigger real chaos experiments.

Also added two Overview bullets (test execution/queued run inspection, direct API access) and two Usage Notes bullets (list_teams for discovering team IDs; *_RUN privilege requirement for test-triggering operations).

Corrected

• get_reliability_experiments was missing the includeScenarioRun (optional, default false) parameter.

Scope is limited to the Overview, Available Tools, and Usage Notes sections of Readme.md; no other files changed.

Everything above was verified directly against the tool registrations in src/ (not against a running server) — see src/tools/index.ts for the full registration list and the individual files under src/tools/ for each tool's schema.