Merge branch 'cora/vmc-466-sync-package-version'

fix(release): sync package.json version in release target (VMC-466)

Release v0.3.1

Release v0.3.0

Merge branch 'cora/changelog-fix-read-message'

docs(changelog): fold read_message auto-mark into Added entry

Merge branch 'cora/changelog-0.3.0'

docs(changelog): Unreleased section for Maildir persistence + state machine

Merge branch 'cora/gitignore-test-artifacts'

chore: gitignore coverage/ and session-notes/ test artifacts

Merge branch 'feat/VMC-490-maildir-message-state-mark_read-flags-and-bulk'

feat(maildir): R flag on reply + unread count in status (VMC-490 impl-004)

feat: list_messages gains include_body, body_max_length, unread filter

feat(maildir): read_message auto-marks + mark_read MCP tool (VMC-490 impl-002)

feat(maildir): mark_read core -- flag rename + new/ to cur/ move (VMC-490 impl-001)