Resolves#12. The claude-code SDK stores conversations in
/root/.claude/sessions/ and Postgres tracks current_session_id, but the
container filesystem was recreated on every restart — next agent message
failed with "No conversation found with session ID: <uuid>".
Add a per-workspace named Docker volume (ws-<id>-claude-sessions) mounted
read-write at /root/.claude/sessions. Gated by runtime=claude-code so
other runtimes don't pay for a path they don't use. Volume is cleaned up
in RemoveVolume alongside the config volume.
Two opt-outs discard the volume before restart for a fresh session:
- env WORKSPACE_RESET_SESSION=1 on the container
- POST /workspaces/:id/restart?reset=true (or {"reset": true} body)
Plumbed via new ResetClaudeSession field on WorkspaceConfig +
provisionWorkspaceOpts helper so the flag stays request-scoped (not
persisted on CreateWorkspacePayload).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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