Loki Mode v7.104.1

Bun doctor checks Claude login (bash/Bun parity)

• loki doctor (Bun route) now performs the Claude OAuth login check that the
  bash route already had. Previously the Bun doctor only checked ANTHROPIC_API_KEY
  and never inspected the Claude login state, so on a machine with an expired Claude
  access token the two routes diverged (bash warned "login EXPIRED", Bun said nothing).
  The check is a zero-network read of ${CLAUDE_CONFIG_DIR:-~/.claude}/.credentials.json
  comparing claudeAiOauth.expiresAt against now; it is byte-faithful with the bash
  output in every login state (expired -> WARN, absent/fresh -> the neutral line), so
  the two routes agree. Conservative by design (no refresh attempt, which needs a
  network call), matching run.sh's fail-fast build preflight. Proven parity across
  expired / absent / fresh credential fixtures.