fix: split send_email into two JMAP calls, add identityId

fix: pass submission using to Identity/get in _get_sender_identity

feat: add V2 write tools (send, mark read/unread, move, archive, trash, flag)

spec: update API token section with 1Password details and Claude Code instructions

spec: V2 — add send, mark read/unread, move, archive, trash, flag tools

Remove confidential client references from README

Remove confidential client from DCR endpoint

Update README with setup guide and claude.ai OAuth compatibility notes

Fix OAuth flow: strip trailing slashes and use standard port 443

Fix issuer mismatch in OAuth AS metadata

Add DCR endpoint and public client for claude.ai compatibility

Proxy Cognito OAuth metadata for claude.ai compatibility

Fix OAuth discovery: serve metadata at root well-known path

Implement Fastmail MCP server with Cognito OAuth

Add project plan for Fastmail MCP server