v3.4.0

Changes

• release: v3.4.0
• fix: separate --rich Markdown lists lacking a preceding blank line (#11) (#19)
• fix: pass real IMAP UIDs directly, dropping sequence-number conversion (#14) (#15)
• fix(packaging): add build-system + py-modules so editable install works
• fix: guard requests import + declare dep; CI installs from pyproject; document features
• feat: add stats subcommand + version-control oc-helper scripts
• chore: release v3.1.1
• fix: remove UID-to-sequence conversion for waggle 1.9.12+