DM-52724: Allow for cell coadds with edges

.pre-commit-config.yaml

@@ -1,22 +1,22 @@
 repos:
   - repo: https://github.com/pre-commit/pre-commit-hooks
-    rev: v5.0.0
+    rev: v6.0.0
     hooks:
       - id: check-yaml
       - id: end-of-file-fixer
       - id: trailing-whitespace
   - repo: https://github.com/psf/black
-    rev: 25.1.0
+    rev: 25.9.0
     hooks:
       - id: black
-        language_version: python3.12
+        language_version: python3.13
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.
-    rev: v0.11.6
+    rev: v0.14.1
     hooks:
       - id: ruff
   - repo: https://github.com/pycqa/isort
-    rev: 6.0.1
+    rev: 7.0.0
     hooks:
       - id: isort
         name: isort (python)

doc/changes/DM-52724.api.rst

@@ -0,0 +1 @@
+StitchedCoadd objects have a new `set_cell_edges` method to mark the cell boundaries with a mask bit.

doc/changes/DM-52724.bug.rst

@@ -0,0 +1 @@
+Save the mask bit definitions in a new MASKDEF binary table.

doc/changes/DM-52724.feature.rst

@@ -0,0 +1 @@
+Cell-based coadds are no longer assumed to be edge-free. Coadds with edges are fully supported.

mypy.ini

@@ -18,6 +18,9 @@ ignore_errors = True
 [mypy-astropy.io]
 ignore_missing_imports = True
 
+[mypy-astropy.table]
+ignore_missing_imports = True
+
 # Check all of cell_coadds...
 
 [mypy-lsst.cell_coadds.*]

python/lsst/cell_coadds/_common_components.py

@@ -25,13 +25,14 @@
 
 import enum
 from abc import ABC, abstractmethod
-from dataclasses import dataclass
+from collections.abc import Mapping
+from dataclasses import dataclass, field
 from typing import TYPE_CHECKING
 
 if TYPE_CHECKING:
-    from lsst.afw.geom import SkyWcs  # pragma: no cover
+    from lsst.afw.geom import Polygon2D, SkyWcs  # pragma: no cover
 
-    from ._identifiers import PatchIdentifiers  # pragma: no cover
+    from ._identifiers import ObservationIdentifiers, PatchIdentifiers  # pragma: no cover
 
 
 class CoaddUnits(enum.Enum):
@@ -84,6 +85,10 @@ class CommonComponents:
     identifiers: PatchIdentifiers
     """Struct of unique identifiers for this coadd's patch."""
 
+    visit_polygons: Mapping[ObservationIdentifiers, Polygon2D] = field(default_factory=dict)
+    """Mapping each (visit, detector) observation to a polygon within the
+    patch bounding box."""
+
 
 class CommonComponentsProperties(ABC):
     """A mix-in class that provides properties for all common components to