Fix ally/target bugs, OCR fire-support parsing, add debug capture

- Board.clear() now also drops allies; the "clear board?" guard checks
  allies too. New Board.clear_units() + Clear button right-click menu
  ("clear enemies, units & flights", keeps Nest/spotters/RPs).
- An Ally with the ad-hoc TargetType.ENEMY showed "Enemy" on the map
  popover/toast instead of "Ally" (icons.target_type_label already had
  the fix for the picker, now reused everywhere else via app.py's
  _display_name).
- Firing panel drag-reorder no longer triggers a full app refresh
  (solver + dedupe + map redraw) on every drop, just a local rebuild.
- "Always show geo" didn't draw for Allies (missing from the overlay
  candidate list); blast radius only respected selection, not the
  show_geo_desc pin.
- ocr.py: added a second fire-support-request grammar ("Infantry#N
  taking fire ... Requesting X Shell on our position at <coord> before
  <time>", plus a bearing/distance-from-position variant), distinct
  from the existing Marine Garrison one.
- New debug_capture.py: saves screenshots (+ metadata) the app handled
  badly, for later tuning of map_vision/ocr against real failures:
  map-read errors, user grid corrections (paired with the auto-detected
  grid), screenshots that read as text but may have been a map, and
  marker-detection ground truth (every proposal's accept/reject verdict
  plus units added with no matching proposal) captured whenever a
  screenshot stops being the active one.
- README: Known issues section (map screenshot reading, grid + unit
  detection, is unreliable and fails often).
- 14 new tests (tests/test_models.py, tests/test_debug_capture.py, +
  additions to tests/test_ocr.py), 38/38 passing.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

tests/test_models.py

@@ -0,0 +1,79 @@
+"""Regression coverage for Board's bulk-mutation helpers (clear/clear_units)
+and the id namespaces Target/Ally are supposed to keep separate."""
+from fenigma.models import Board, Coord, TargetType
+
+
+def _coord(x=0, y=0):
+    return Coord(X="A", Y=1, x=x, y=y)
+
+
+def test_clear_drops_allies_too():
+    """Board.clear() used to leave self.allies untouched -- the "clear
+    board" action then reported success but a previously-placed ally
+    stayed on the map."""
+    board = Board()
+    board.nest.coord = _coord()
+    board.add_spotter(_coord())
+    board.add_reference_point(_coord())
+    board.add_target(TargetType.TANK, _coord())
+    board.add_ally(TargetType.TANK, _coord())
+    board.add_scout_flight((1.0, 1.0), 45.0)
+
+    board.clear()
+
+    assert board.nest.coord is None
+    assert board.spotters == []
+    assert board.reference_points == []
+    assert board.targets == []
+    assert board.allies == []
+    assert board.scout_flights == []
+
+
+def test_clear_units_keeps_recon_infrastructure():
+    """The Clear button's right-click "Clear enemies, units & flights"
+    option: drops targets/allies/scout flights but keeps the Nest,
+    spotters, and reference points."""
+    board = Board()
+    board.nest.coord = _coord()
+    sp = board.add_spotter(_coord())
+    rp = board.add_reference_point(_coord())
+    board.add_target(TargetType.TANK, _coord())
+    board.add_ally(TargetType.TANK, _coord())
+    board.add_scout_flight((1.0, 1.0), 45.0)
+
+    board.clear_units()
+
+    assert board.nest.coord is not None
+    assert board.spotters == [sp]
+    assert board.reference_points == [rp]
+    assert board.targets == []
+    assert board.allies == []
+    assert board.scout_flights == []
+
+
+def test_ally_and_target_ids_are_independent_namespaces():
+    """An ally Tank#1 and a hostile Target Tank#1 are unrelated -- adding
+    one must never be influenced by the other's ids, and auto-assignment
+    on each side starts from 'A' independently."""
+    board = Board()
+    t1 = board.add_target(TargetType.TANK, _coord(), id_="1")
+    a1 = board.add_ally(TargetType.TANK, _coord(), id_="1")
+    assert t1.id == a1.id == "1"
+    assert t1 is not a1
+
+    t_auto = board.add_target(TargetType.TANK, _coord())
+    a_auto = board.add_ally(TargetType.TANK, _coord())
+    assert t_auto.id == "A"  # first free letter among *targets* only
+    assert a_auto.id == "A"  # first free letter among *allies* only, unaffected by the target above
+
+
+def test_find_by_name_prefers_target_over_same_named_ally():
+    """find_by_name() (used to resolve Clue references) checks targets
+    before allies -- documented, deliberate priority, not a namespace
+    collision: an ally and a same-typed/same-id target are still two
+    distinct objects, this only matters when something's Clue names one
+    ambiguously by the shared display name."""
+    board = Board()
+    target = board.add_target(TargetType.TANK, _coord(x=1), id_="1")
+    board.add_ally(TargetType.TANK, _coord(x=2), id_="1")
+    assert board.find_by_name("Tank#1") is target