Loki Mode

Verification-credibility sweep (the trust layer is now honest and real)

This release makes Loki's verification layer match its claims. An internal audit
found gates that were advertised but hollow, unwired, or described inaccurately.
The fix: make every gate real or stop claiming it. The deterministic gate set is
now an honest 8.

• Mock-integrity and test-mutation detectors are now wired as blocking gates.
  tests/detect-mock-problems.sh and tests/detect-test-mutations.sh existed but
  were never invoked by the build loop. They now run every iteration: HIGH-severity
  findings block; Medium/Low are advisory and injected into the next iteration.
  Opt out with LOKI_GATE_MOCK=0 / LOKI_GATE_MUTATION=0. Both detectors honor
  LOKI_SCAN_DIR so they scan the target project, not the Loki install.
• Anti-sycophancy now acts, not just logs. On a unanimous code-review PASS, a
  Devil's-Advocate reviewer is dispatched; a Critical/High finding blocks
  completion. Previously this path only wrote an audit note. Opt out with
  LOKI_GATE_DEVILS_ADVOCATE=0.
• Test-coverage gate honesty. The gate ran tests for pass/fail but never
  measured a coverage percentage, while docs claimed ">80% coverage". Docs and
  log labels now state pass/fail accurately; the min_coverage JSON field is
  retained as a target. Real coverage measurement is a planned follow-up.
• Phantom gates removed. "Input Guardrails" and "Output Guardrails" were
  listed among the gates but had no implementation. Removed. The canonical count
  is now 8: static analysis, test suite (pass/fail), blind 3-reviewer code review
  with severity blocking, anti-sycophancy Devil's Advocate, mock integrity, test
  mutation, documentation coverage, and Magic Modules debate. Backward-compat is a
  conditional healing-mode auditor, not one of the 8.
• Severity-blocking documented accurately. Code-review blocks on Critical/High
  only; Medium/Low are advisory. Docs and the dashboard-served gate list now match
  the code (previously several surfaces said Medium blocks).
• Bun-route parity for the new gates and the Devil's-Advocate toggle in
  loki-ts/src/runner/quality_gates.ts.
• Regression guards added (tests/test-p0-verification-sweep.sh,
  tests/test-p0-gate-behavior.sh, wired into local-ci) so gate-count and
  severity-blocking claims cannot silently drift again.

Reviewed by a 3-of-3 unanimous completion council. No runtime behavior changes
beyond the gates now actually blocking on the conditions documented.