[CHORE] Drop unused __about__.py files from Python packages

[Seth Fitzsimmons (sethfitz)]

Closes #549.

Deletes the 12 __about__.py version shims. #534 moved every package to a static version in pyproject.toml and rewrote the shims to read importlib.metadata; nothing references __about__ or __version__ anywhere in the tree (verified across packages/, .github/, and the Makefile on current main).

#534 has merged, so this PR now targets main and drops the shims as dead code.

[github-actions]

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🕐 Updated	Jul 15, 2026 16:30 UTC
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[Seth Fitzsimmons (sethfitz)]

The failing Check (lowest-direct, py3.10) leg is unrelated to this change — typing_extensions 4.16.0 changed the MISSING sentinel repr that a Feature doctest pins. Tracked in #554.

[Victor Schappert (vcschapp)]

Seth Fitzsimmons (@sethfitz) One check failing:

Check Python package code / Check (lowest-direct, py3.10) (pull_request)Failing after 44s

Looks like a single example test failed, and the problem looks like a Python output style change between 3.10 and 3.14?

Run make check
make[1]: Entering directory '/home/runner/work/schema/schema'
229 files already formatted
**********************************************************************
File "/home/runner/work/schema/schema/packages/overture-schema-system/src/overture/schema/system/feature.py", line 162, in overture.schema.system.feature.Feature
Failed example:
    FarmFeature.validate_json('''{
        "type": "Feature",
        "geometry": {
            "type": "LineString",
            "coordinates": [[0, 0], [0, 0.01]]
        },
        "properties": {
            "type": "fence",
            "subtype": "barb_wire_4"
        }
    }''')
Expected:
    Fence(id=<MISSING>, bbox=<MISSING>, geometry=<<LINESTRING (0 0, 0 0.01)>>, type='fence', subtype='barb_wire_4', height=None)
Got:
    Fence(id=MISSING, bbox=MISSING, geometry=<<LINESTRING (0 0, 0 0.01)>>, type='fence', subtype='barb_wire_4', height=None)
**********************************************************************
1 items had failures:
   1 of  18 in overture.schema.system.feature.Feature