fix(tokens): restore token_phase_flush re-baseline; drop stray block from gate_token_check

The per-gate functions were inserted immediately after token_phase_flush's log
line, which split the function: its trailing re-baseline block (the
'if next_phase_id is not None: ...' that re-seeds the per-phase baseline for the
next phase, or finalizes when None) was orphaned onto the end of gate_token_check,
where next_phase_id is undefined. The watchdog therefore crashed with NameError on
the first tick of every start. Move that block back into token_phase_flush (where
next_phase_id/cur/sf are in scope) and end gate_token_check at its log line.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UWTdUq2bsic7JZGqJp3nD6

agents.py

@@ -757,6 +757,12 @@ def token_phase_flush(cfg, next_phase_id):
         fh.write(json.dumps(rec) + "\n")
     parts = ", ".join(f"{n}={per_agent[n]['total']:,}" for n in per_agent)
     log(f"[log_tokens] phase {rec['phase_id']}: {total['total']:,} tok in {dur}s ({parts})")
+    if next_phase_id is not None:
+        sf.write_text(json.dumps({"phase_id": next_phase_id,
+                                  "started": datetime.now().isoformat(timespec="seconds"),
+                                  "baseline": cur}))
+    else:
+        sf.unlink(missing_ok=True)
 
 # ── token logging granularity: per phase, or also per GATE (log_tokens) ────────────
 # Phases are tracked per phase (token_phase_begin/flush). With token_granularity="gate" (the default)
@@ -844,12 +850,6 @@ def gate_token_check(cfg):
                               "started": datetime.now().isoformat(timespec="seconds"),
                               "baseline": _token_cumulative(cfg)}))
     log(f"[log_tokens] tracking gate: {current}")
-    if next_phase_id is not None:
-        sf.write_text(json.dumps({"phase_id": next_phase_id,
-                                  "started": datetime.now().isoformat(timespec="seconds"),
-                                  "baseline": cur}))
-    else:
-        sf.unlink(missing_ok=True)
 
 def phase_advance_check(cfg):
     """On heavy tick: if the current phase is DONE, advance (or finish the sequence).