After PR4 every protected request demands wid. Three JWT-issue paths
must encode it; T4.8/T4.9 covered /initialize and /register, and this
commit closes the remaining two:
- login_local calls _ensure_default_workspace (idempotent — returns
the existing default_workspace_id when set) so users who pre-date
PR4 are backfilled at login time, and signs the new cookie with
wid + role='owner'.
- change_password does the same, ensuring a password change does not
strip the workspace claim and lock the user out on their next
request.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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