chore: finalize v0.7 public API and release checks

[mwyau]

Summary

• Curate the public package and algorithm namespace boundaries for the v0.7 prerelease.
• Preserve advanced direct APIs while removing implementation and TrackJSON wire re-exports from package namespaces.
• Remove constructor catch-all keyword arguments from Simple, Hodges, and Healpix trackers.
• Align API/CLI/quickstart/contributing documentation with the supported surface and strict docs CI.
• Update Read the Docs Mermaid handling, Dependabot scheduling, and the pre-commit ty hook to v0.0.74.
• Add focused namespace/API regression coverage.

Validation

Passed:

• uv lock --check
• Ruff check and format
• direct project ty check
• uv run mypy
• TrackJSON schema check
• unit tests: 519 passed
• non-slow, non-data integration tests: 20 passed
• non-slow, non-data parity tests: 1 passed
• strict Sphinx build with warnings treated as errors
• CLI help audit and focused API tests

Known environment/tooling gates:

• prek run --all-files: all hooks pass except ty v0.0.74, which reports 1,107 Numba Dispatcher typing diagnostics; the project-pinned direct ty check passes. The v0.0.74 pin is intentional for the requested Dependabot/pre-commit cleanup.
• Data-dependent parity/integration gates require the current v0.2.0-data assets, which are not available in this checkout; the available cache is from v0.1.4-data. No data was downloaded or silently skipped.

No tracking algorithms, numerical defaults, TrackJSON wire/schema behavior, version, benchmarks, or scientific data were changed. PR #201 was not merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.32%. Comparing base (4cbb63e) to head (017af78).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #202      +/-   ##
==========================================
+ Coverage   78.31%   78.32%   +0.01%     
==========================================
  Files          58       59       +1     
  Lines        9621     9612       -9     
  Branches     1870     1867       -3     
==========================================
- Hits         7535     7529       -6     
+ Misses       1370     1368       -2     
+ Partials      716      715       -1     

Flag	Coverage Δ
integration	51.63% <100.00%> (+0.04%)	⬆️
parity	17.51% <100.00%> (+0.01%)	⬆️
unit	57.05% <100.00%> (-0.01%)	⬇️
unit-jit-coverage	72.49% <100.00%> (+<0.01%)	⬆️
unit-jit-disabled	73.83% <100.00%> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/pystormtracker/backends.py	79.01% <ø> (ø)
src/pystormtracker/healpix/tracker.py	56.80% <ø> (+0.78%)	⬆️
src/pystormtracker/hodges/__init__.py	100.00% <100.00%> (ø)
src/pystormtracker/hodges/linker.py	81.17% <ø> (ø)
src/pystormtracker/hodges/tracker.py	61.84% <ø> (-0.33%)	⬇️
src/pystormtracker/io/__init__.py	100.00% <ø> (ø)
src/pystormtracker/io/track.py	64.58% <ø> (ø)
src/pystormtracker/models/time.py	66.50% <ø> (ø)
src/pystormtracker/models/tracker.py	100.00% <ø> (ø)
src/pystormtracker/preprocessing/__init__.py	100.00% <100.00%> (ø)
... and 4 more