fix(generate-docs): fix tool description extraction for two-step and name-mismatch patterns

Replace the fragile first-id/first-description heuristic with a per-id
window search: for each id: 'tool_id' match, scan the next 600 chars
(stopping before any params: block) for description: and name: fields.
This correctly handles the two-step pattern used by Intercom and others
where the ToolConfig export comes after a separate base object whose
params: would have cut off the old approach.

Add an exact-name fallback that checks tools.access for a tool whose
name matches the operation label — handles cases where block op IDs are
short aliases (e.g. Slack 'send') while the tool ID is more descriptive
('slack_message') but the tool name 'Slack Message' still differs.

Remove the word-overlap scoring fallback which was producing incorrect
descriptions (Intercom all saying 'Intercom API access token', Reddit
Save/Unsave inverted, etc.).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: waleedlatif1