v1.9.0: MCP onboarding expansion + edge case tests

What's Changed

• docs: add lint/format guidance to CONTRIBUTING.md to prevent ruff CI failures by @Alphanymous with @Copilot in #80
• [WIP] Add incremental indexing and file watcher for large vaults by @Alphanymous with @Copilot in #83
• [WIP] Add read-only scopes and audit logging for MCP clients by @Alphanymous with @Copilot in #82
• feat: add text-paste import (ele paste + web UI + .txt files) by @Alphanymous in #84
• [WIP] Add memory export feature for AI formats by @Alphanymous with @Copilot in #85

New Contributors

• @Alphanymous with @Copilot made their first contribution in #80

Full Changelog: v1.7.4...v1.9.0