Kyle Isom 190368290b Add SSO login support ...

MCAT can now redirect users to MCIAS for SSO login (including passkey
support) instead of showing its own login form. SSO is opt-in via the
[sso] config section.

- Add SSO landing page with "Sign in with MCIAS" button
- Add /sso/redirect and /sso/callback routes
- Update mcdsl to v1.5.0 (sso package)
- Fix .gitignore: /mcat ignores only the root binary, not cmd/mcat/
- Track cmd/mcat/ source files (previously gitignored by accident)

Security:
- State cookie uses SameSite=Lax for cross-site redirect compatibility
- Session cookie remains SameSite=Strict after login

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

2026-03-30 17:19:24 -07:00

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