feat: add portable Google Docs and Calendar support

[mohammedahmed18]

Summary

• add hosted portable bootstrap, fetch, and render contracts for Google Docs and Calendar
• require stable folder roots and explicit Calendar windows
• harden pagination and duplicate inventory handling

Verification

• cargo test -p locality-google-docs
• cargo test -p locality-google-calendar
• cargo fmt checks
• independent contract review

[vercel]

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Project	Deployment	Actions	Updated (UTC)
locality	Ready	Preview	Aug 26, 2026 8:46am

[github-actions]

Codex review

• severity: minor
  file/line: docs/google-docs-connector.md
  failure mode: The new docs state that Google Docs hosted portable export is available, but this PR does not implement any Google Docs portable connector methods. GoogleDocsConnector still relies on the default Connector portable methods, so users/operators following this doc will hit unsupported/not implemented behavior.
  minimal fix/test: Remove this section from this PR, or add the Google Docs portable implementation plus focused bootstrap/fetch/render tests covering the documented workspace-folder behavior.

I did not run the Rust test suite because the checkout is read-only and builds would need to write artifacts. git diff --check passed.