chore(central-ripout 2d-i): relocate the fire engine + renderer out of central/ (#164)

Moves the last two live files out of the retired-Central folder. central/ is
now EMPTY and deleted entirely (incl. __init__.py).

- fire-fusion engine (ingest_hotspot_pixel + the growth/cluster/spotting
  engine) → env/fire_fusion.py, next to its sole consumer env/firms.py.
- wildfire text renderer (_render + its live helpers) → env/fire_render.py.

THE COUPLING RESOLVED: firms_handler._handle_pass_boundary had a LAZY import
inside a function body — `from meshai.central.wfigs_handler import _render` —
sitting on the live FIRMS fire-growth path. It is now a normal top-of-file
import (`from meshai.env.fire_render import _render`), visible and greppable.

PURE MOVE — no behavior change:
- The parity oracle (test_fire_refactor.py) PASSES UNCHANGED (only its import
  paths updated) — proving the fire wire output is byte-for-byte identical
  before and after. Fire alerts say exactly what they said.
- handle_firms / handle_wfigs (dead entrypoints, only caller was the deleted
  consumer.py) were KEPT and moved rather than dropped — the wording-cleanup
  PR removes them deliberately. "When unsure, keep."
- fire_render.py's geo-helper imports still point at central_normalizer — that
  file's split is a SEPARATE PR; carried the imports along, did not touch it.

Consumers + test import paths rewired. Full suite: 2059 passed, 0 failed.

Co-authored-by: Matt Johnson <mj@k7zvx.com>
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

work/tests/test_import_smoke.py

@@ -3,6 +3,13 @@ must be importable without error after the budget shim refactor.
 
 This guards against a broken import chain (e.g. circular imports or a bad
 re-export in the shim) that would silently break all handlers.
+
+chore/ripout-2d: the last two central/ handlers (firms_handler.py,
+wfigs_handler.py) relocated to meshai/env/fire_fusion.py + fire_render.py
+(central/ has no *_handler.py left -- the fusion engine's only consumer is
+the native env/firms.py adapter). The glob below now also covers those two
+explicitly so this guard still exercises the relocated live import chain;
+it keeps globbing central/ too in case a future handler lands back there.
 """
 
 import glob
@@ -11,17 +18,16 @@ import os
 
 
 def _handler_modules():
-    """Collect meshai.central.*_handler module names by globbing the source tree."""
-    pattern = os.path.join(
+    """Collect handler-ish module names: meshai.central.*_handler (glob) +
+    the fire-fusion modules relocated out of central/ during the ripout."""
+    central_pattern = os.path.join(
         os.path.dirname(__file__),
         "..", "meshai", "central", "*_handler.py",
     )
-    paths = sorted(glob.glob(pattern))
-    assert paths, "No *_handler.py files found — check the glob path"
-    modules = []
-    for p in paths:
-        name = os.path.basename(p)[:-3]  # strip .py
-        modules.append(f"meshai.central.{name}")
+    central_paths = sorted(glob.glob(central_pattern))
+    modules = [f"meshai.central.{os.path.basename(p)[:-3]}" for p in central_paths]
+    modules += ["meshai.env.fire_fusion", "meshai.env.fire_render"]
+    assert modules, "No handler-ish modules found — check the glob path"
     return modules