Merge development: siGit Code Cloud Sessions

Persisted, resumable Cloud Sessions for siGit Code Cloud (server-side session + message store, token-scoped API at /api/v1/sessions). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Seto Elkahfi committed Jun 26, 2026 at 16:44 UTC 405f36d38b35b6ec2ceb7593c81bb9d09505f712

No changes.