feat: speak file:line refs as "line N of file"

[StuBehan]

Summary

Folds a file:line-reference rule into the existing dev_terms normalization pass. engine.py:42 was reaching espeak raw and voicing as "dot py colon forty two"; spoken, the line number is the signal and the filename is noise, so it's re-ordered to lead with the line.

Changes

• foo.ts:666 → "line 666 of foo ts" — basename only (directories dropped; "src/" reads as "slash"), dotted name voiced word by word.
• Ranges and columns: cli.py:100-118 → "lines 100 to 118 of cli py"; foo.ts:666:10 → "line 666, column 10 of foo ts".
• Triggered by the :line suffix, so times, ratios, verses, and dotted versions (12:30, 3:1, John 3:16, 1.2.3) are left untouched.
• Runs early (before the number/version/unit stages and the dev-term dict), gated on dev_terms (default on) — no new flag.

Testing

• 8 new tests/test_text.py cases (basename/range/column, and the untouched times/ratios/versions).
• ruff check + ruff format --check clean; mypy clean; pytest — 203 passed.

CHANGELOG.md intentionally untouched — release-please owns it; this lands as a feat in the next release.