fix(honcho): dialectic lifecycle — defaults, retry, prewarm consumption

Several correctness and cost-safety fixes to the Honcho dialectic path
after a multi-turn investigation surfaced a chain of silent failures:

- dialecticCadence default flipped 3 → 1. PR #10619 changed this from 1 to
  3 for cost, but existing installs with no explicit config silently went
  from per-turn dialectic to every-3-turns on upgrade. Restores pre-#10619
  behavior; 3+ remains available for cost-conscious setups. Docs + wizard
  + status output updated to match.

- Session-start prewarm now consumed. Previously fired a .chat() on init
  whose result landed in HonchoSessionManager._dialectic_cache and was
  never read — pop_dialectic_result had zero call sites. Turn 1 paid for
  a duplicate synchronous dialectic. Prewarm now writes directly to the
  plugin's _prefetch_result via _prefetch_lock so turn 1 consumes it with
  no extra call.

- Prewarm is now dialecticDepth-aware. A single-pass prewarm can return
  weak output on cold peers; the multi-pass audit/reconcile cycle is
  exactly the case dialecticDepth was built for. Prewarm now runs the
  full configured depth in the background.

- Silent dialectic failure no longer burns the cadence window.
  _last_dialectic_turn now advances only when the result is non-empty.
  Empty result → next eligible turn retries immediately instead of
  waiting the full cadence gap.

- Thread pile-up guard. queue_prefetch skips when a prior dialectic
  thread is still in-flight, preventing stacked races on _prefetch_result.

- First-turn sync timeout is recoverable. Previously on timeout the
  background thread's result was stored in a dead local list. Now the
  thread writes into _prefetch_result under lock so the next turn
  picks it up.

- Cadence gate applies uniformly. At cadence=1 the old "cadence > 1"
  guard let first-turn sync + same-turn queue_prefetch both fire.
  Gate now always applies.

- Restored query-length reasoning-level scaling, dropped in 9a0ab34c.
  Scales dialecticReasoningLevel up on longer queries (+1 at ≥120 chars,
  +2 at ≥400), clamped at reasoningLevelCap. Two new config keys:
  `reasoningHeuristic` (bool, default true) and `reasoningLevelCap`
  (string, default "high"; previously parsed but never enforced).
  Respects dialecticDepthLevels and proportional lighter-early passes.

- Restored short-prompt skip, dropped in ef7f3156. One-word
  acknowledgements ("ok", "y", "thanks") and slash commands bypass
  both injection and dialectic fire.

- Purged dead code in session.py: prefetch_dialectic, _dialectic_cache,
  set_dialectic_result, pop_dialectic_result — all unused after prewarm
  refactor.

Tests: 542 passed across honcho_plugin/, agent/test_memory_provider.py,
and run_agent/test_run_agent.py. New coverage:
- TestTrivialPromptHeuristic (classifier + prefetch/queue skip)
- TestDialecticCadenceAdvancesOnSuccess (empty-result retry, pile-up guard)
- TestSessionStartDialecticPrewarm (prewarm consumed, sync fallback)
- TestReasoningHeuristic (length bumps, cap clamp, interaction with depth)
- TestDialecticLifecycleSmoke (end-to-end 8-turn session walk)

plugins/memory/honcho/cli.py

@@ -460,17 +460,17 @@ def cmd_setup(args) -> None:
             pass  # keep current
 
     # --- 7b. Dialectic cadence ---
-    current_dialectic = str(hermes_host.get("dialecticCadence") or cfg.get("dialecticCadence") or "3")
+    current_dialectic = str(hermes_host.get("dialecticCadence") or cfg.get("dialecticCadence") or "1")
     print("\n  Dialectic cadence:")
     print("    How often Honcho rebuilds its user model (LLM call on Honcho backend).")
-    print("    1 = every turn (aggressive), 3 = every 3 turns (recommended), 5+ = sparse.")
+    print("    1 = every turn (default), 3+ = sparse (cost-saving).")
     new_dialectic = _prompt("Dialectic cadence", default=current_dialectic)
     try:
         val = int(new_dialectic)
         if val >= 1:
             hermes_host["dialecticCadence"] = val
     except (ValueError, TypeError):
-        hermes_host["dialecticCadence"] = 3
+        hermes_host["dialecticCadence"] = 1
 
     # --- 8. Session strategy ---
     current_strat = hermes_host.get("sessionStrategy") or cfg.get("sessionStrategy", "per-session")
@@ -636,7 +636,7 @@ def cmd_status(args) -> None:
     print(f"  Recall mode:    {hcfg.recall_mode}")
     print(f"  Context budget: {hcfg.context_tokens or '(uncapped)'} tokens")
     raw = getattr(hcfg, "raw", None) or {}
-    dialectic_cadence = raw.get("dialecticCadence") or 3
+    dialectic_cadence = raw.get("dialecticCadence") or 1
     print(f"  Dialectic cad:  every {dialectic_cadence} turn{'s' if dialectic_cadence != 1 else ''}")
     print(f"  Observation:    user(me={hcfg.user_observe_me},others={hcfg.user_observe_others}) ai(me={hcfg.ai_observe_me},others={hcfg.ai_observe_others})")
     print(f"  Write freq:     {hcfg.write_frequency}")