temporal + located companion channels through the kernel and the pyramid (issue #410)

pyproject.toml

@@ -37,7 +37,13 @@ dependencies = [
     # what PyPI has published (as 0.2.0 once was) fails resolution loudly — the
     # state build_layer.sh's MORTIE_SPEC derivation cites this block for.
     "h5coro-hidefix>=0.3.2",
-    # Floor 0.9.8 for the authalic latitude convention (espg/mortie#186, landed
+    # Floor 0.9.9 for the SEGMENTED toc reduce (espg/mortie#177, released in
+    # 0.9.9): tocs_reduce(words, offsets) is the per-group semilattice join the
+    # spec §8.2/§8.3 temporal companions fold with — one Rust crossing for a
+    # whole cell's centroid partition, where the scalar toc_reduce 0.9.6 ships
+    # would be a Python loop per centroid (issue #410,
+    # zagg.stats.tdigest._centroid_envelopes). Earlier floors: 0.9.8
+    # for the authalic latitude convention (espg/mortie#186, landed
     # in espg/mortie#188): binning is equal-area on the WGS84 ellipsoid by
     # construction — latitude="authalic" is the new mortie default, with
     # "geodetic-spherical" as the legacy escape. Cell ids differ between the
@@ -71,7 +77,7 @@ dependencies = [
     # route through (issue #199) — decimal_repr / to_decimal, the
     # _decimal_to_word parse-back, hive_path, and the MortonIndexScalar decimal
     # display.
-    "mortie>=0.9.8",
+    "mortie>=0.9.9",
     "earthaccess",
     "boto3",
     "fastparquet",

src/zagg/stats/__init__.py

@@ -1,5 +1,6 @@
 """Statistical algorithms for zagg aggregation (issue #48)."""
 
 from .tdigest import build_tdigest, merge_tdigests
+from .toc import cell_envelope, cell_envelopes
 
-__all__ = ["build_tdigest", "merge_tdigests"]
+__all__ = ["build_tdigest", "cell_envelope", "cell_envelopes", "merge_tdigests"]