Loki Mode v7.103.0

Bun-runner gate parity + verify.sh hardening

• Bun runner honors all completion-blocking gates (loki-ts/src/runner/autonomous.ts):
  it already refused completion on a code_review BLOCK; it now also refuses on a
  semantic_tests BLOCK and an invariants BLOCK, mirroring the live bash route
  exactly (same LOKI_GATE_SEMANTIC_TESTS_BLOCK / LOKI_GATE_INVARIANTS_BLOCK
  toggles, same conditions). This closes a trust-parity gap ahead of the runner
  being wired on. It refuses ONLY when the gate genuinely blocked (the gate is in
  the failed set and its toggle is on), so a clean run still completes - no new
  user-visible knob, the existing toggles are reused.
• verify.sh defensive hardening (autonomy/verify.sh): the base ref now
  resolves an actually-existing ref (origin/main, then main) instead of
  hardcoding it in both branches; VERIFY_VERDICT/VERIFY_EXIT are initialized
  before the error path so an early error can never emit an empty or VERIFIED
  verdict or exit 0 (fail-closed).