Loki Mode

Reachable audit helpers + invariant-findings prompt surfacing

• Audit/compliance CLI commands (autonomy/loki): the manifest tamper-evidence
  helpers (v7.55 linkManifest/verifyManifestLink) and the compliance snapshot
  scheduler (v7.54 maybeGenerateSnapshot) shipped as tested-but-not-invoked.
  They are now reachable on demand: loki audit link-manifest [dir] hashes the
  run manifest into the audit chain, loki audit verify-manifest [dir] checks it
  (detects tamper), and loki compliance snapshot [dir] [--force] generates a
  compliance snapshot (respecting the default-disabled interval unless --force).
  All are explicit on-demand commands (never gate or slow a run); honest no-op
  when the manifest is absent.
• Invariant-findings surfaced into the prompt (loki-ts/src/runner/build_prompt.ts):
  the invariant gate wrote .loki/quality/invariant-findings.txt but nothing read
  it into the next-iteration prompt (the actionable per-finding text was not
  surfaced). build_prompt.ts now reads and injects it, mirroring the semantic-
  findings consumer. Closes the writer-with-no-reader on the prompt side.

Gates: local-ci 83/83, bun tests + parity green, 2-reviewer council APPROVE (both
verified the CLI commands work empirically and the prompt injection reaches the
rendered prompt).