feat(cursor): add prompt-aware recall and resilient transcript handling

[voarsh2]

• Add automatic beforeSubmitPrompt recall for every substantive user prompt.
• Build prompt-aware recall queries from recent transcript turns, with configurable roles, tool markers, query length, score floors, and timeout.
• Refresh the workspace rules-file context after successful prompt recall while returning Cursor’s documented {"continue": true} response.
• Improve session-start recall handling with CURSOR_PROJECT_DIR, UTF-8 BOM-safe hook input, configurable API timeout, and the documented additional_context field.
• Fix transcript retention for Cursor 3.x role-nested JSONL payloads and environment-provided transcript/session paths.
• Keep retained content focused on conversation by removing injected memories, <external_links> previews, internal reasoning, and tool traffic by default.
• Preserve structured tool-call data only when explicitly enabled, while retaining channel-message text and avoiding Hindsight feedback loops.
• Ensure repeated retains receive distinct conversation-scoped document IDs and support configurable retained roles.
• Make installation portable across platforms with py -3 on Windows, python3 elsewhere, plus --python-command and --hook-timeout overrides.
• Add hook timeouts of 15s for session/stop hooks and 45s for prompt recall, while preserving stop-hook timing when overrides are used.
• Expand unit, hook, CLI, rules-file, transcript, configuration, and integration coverage.
• Synchronize the package README, integration docs, catalog metadata, Cursor skill guidance, and SDK reference documentation.

Note

Cursor uses additional_context for sessionStart; beforeSubmitPrompt only supports continue, so prompt recall refreshes the workspace rules file instead. The removed additionalContext references reflect the previous Cursor implementation and are not emitted by this branch.

Test plan

• py -3 -m pytest tests -q — 101 passed, 4 skipped
• Covered prompt recall, multi-turn transcript context, score filtering, and timeout configuration
• Covered Cursor 3.x transcript formats, UTF-8 content, BOM input, environment transcript paths, and retention cleanup
• Covered Windows/non-Windows launcher rendering and explicit launcher/timeout overrides
• Covered rules-file generation, .gitignore handling, session context delivery, and end-to-end hook behavior
• Ran Python compilation checks