fix: Fix Windows console issues

[Pringled]

This PR fixes a few issues with older, non-English Windows setups. It also drops the tree-sitter dependency since we get that from semble-grammars, and has a few small doc updates.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Files with missing lines	Coverage Δ
src/semble/cli.py	100.00% <100.00%> (ø)
src/semble/utils.py	100.00% <100.00%> (ø)
src/semble/version.py	100.00% <100.00%> (ø)

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[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge, with no concrete changed-code failures identified.

The console handling is guarded to standard TextIOWrapper streams, path normalization is symmetric for Windows and POSIX separators, and the removed tree-sitter dependency remains supplied by semble-grammars.

_{Reviews (1): Last reviewed commit: "update docs" | Re-trigger Greptile}