Enforce MinHash construction compatibility

[dipeshbabu]

What

Fingerprint the actual permutation matrix and hash callable, then enforce those fingerprints in MinHash operations and all LSH variants.

Why

Sketches with the same seed, length, and scheme can still be incompatible when callers provide different permutations or hash functions. Comparing or indexing them together silently produces invalid similarity results.

Impact

Jaccard, merge, union, LSH, async LSH, LSH Forest, and LSH Bloom now fail clearly when known construction metadata differs. WeightedMinHash remains exempt, and old indexes carrying only scheme metadata remain readable.

Root cause

Compatibility checks treated the seed as a complete identity for permutation generation and did not track the input hash function.

Checks

• uv run pytest -q test/test_minhash.py test/test_minhash_schemes.py test/test_lsh.py test/test_lshforest.py (119 passed)
• uv run pytest -q test/test_lshbloom.py (9 skipped; optional dependency unavailable)
• uv run ruff check on changed Python files
• uvx pyright (0 errors)
• git diff --check

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@3da96a5). Learn more about missing BASE report.
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #326   +/-   ##
=========================================
  Coverage          ?   71.75%           
=========================================
  Files             ?       21           
  Lines             ?     2857           
  Branches          ?        0           
=========================================
  Hits              ?     2050           
  Misses            ?      807           
  Partials          ?        0           

Flag	Coverage Δ
unittests	71.75% <100.00%> (?)

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

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.