Loki Mode

Added

• Uncertainty-gated escalation (default-on, opt out with
  LOKI_UNCERTAINTY_ESCALATION=0). When Loki looks stuck, it now proactively
  escalates to the human (writes a structured handoff, fires an intervention
  notification, drops a .loki/signals/UNCERTAINTY_ESCALATION marker, and
  touches .loki/PAUSE) instead of silently burning iterations until
  max-iterations. The trigger reuses three signals already in the loop, with no
  new metacognition: P1 the circuit-breaker no-change counter, P2 diff-hash
  oscillation (a recurrence A -> B -> A, NOT a trivial A -> A repeat, which is
  P1's territory), and P3 a persistent council split (trailing rounds rejected
  with at least one approver). Escalation fires only when at least two of the
  three co-occur for N consecutive rounds (LOKI_UNCERTAINTY_ROUNDS, default 2),
  so a single noisy proxy cannot escalate alone, and it debounces to once per
  stuck-episode (re-arms when the co-occurrence clears) so it never spams. When
  it fires it prints a loud terminal line naming the opt-out.

NOT tested in this release (honest disclosure)

• Default autonomy mode is "perpetual", where .loki/PAUSE auto-clears, so by
  DEFAULT this feature is NOTIFY-ONLY: it surfaces the stuck state and saves a
  handoff but does not halt the run. It halts only in checkpoint/supervised
  modes. This is disclosed at the escalation site and in the docs.
• The three proxies are heuristics, not true metacognition: they can false-fire
  (escalate when Loki is actually fine) and miss (stay quiet when it is stuck).
  The 2-of-3 + N-round gate reduces but does not eliminate false fires.
• P3 (council split) is stale between council votes (verdicts only append when
  the council actually votes), so the split signal can lag.
• No live multi-iteration autonomous run was used; verification is the decision
  function against per-case throwaway fixtures (42 assertions, including a
  pure-stagnation guard proving P2 does not fire without genuine oscillation)
  plus an end-to-end decision-then-action behavioral check.
• This is a bash-route feature (the completion council is bash-only).