docs: simplify README and verify live tool guidance

[y0u-0]

The README had grown to 555 lines and several guides still described text output, stale tool fields, or setup that needed extra wiring. This reduces the README to 95 lines with a quick start, three example tasks, and links to focused guides.

The docs now cover JSON defaults in published CLI 0.14.0, manual setup checks, session targeting, measurement completion, cleanup limits, and sanitized app-tool failures. The bundled agent skill uses live schemas and explicit evidence criteria. Agent-facing llms.txt now invokes the correct CLI package.

The existing Chromium timeline test now runs the live documentation contract checker against its mounted React/Query/Router app. It caught ten missing input descriptions before the edits and passes for all 80 tool contracts afterward. Native case studies remain labeled as recorded evidence; this change does not claim a new native run.

Validation:

• Documentation lint, types, content checks, and production build.
• Built CLI transcript suite, 52 checks; focused skill install/refresh and docs tests.
• Live Chromium timeline and schema checks; desktop/mobile docs navigation and markdown endpoints.
• Independent review; fixed a checker progress line to preserve JSON stdout.

Deployment: deploy the merged docs build to the existing Cloudflare Worker and verify public HTML/markdown endpoints.

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commit: 0035845