Adds regression tests for already-implemented Sprint 3 items so
future refactors can't silently regress these behaviors:
- terminal::color::tests::default_theme_preserves_rgb_precision
Locks in the C1 contract: when Theme::background is Rgb, the
exact 8-bit values (julia256's core.bg = 58,58,58) survive.
The parser may also emit Indexed(237) for the same source
value depending on detected color depth, so the test accepts
either variant but verifies 24-bit precision when present.
- terminal::color::tests::light_theme_preserves_rgb_precision
Same invariant for LIGHT_THEME (sand256 bright off-white
foreground > 200 RGB).
- editor::tests::bookmark_jump_restores_both_line_and_column
Locks in the C5 contract: jumping to a named bookmark must
restore both the line AND the column where the bookmark was
set. The existing test only verified the byte offset, not
the column, so a future regression to line-only restoration
would not have been caught.
Tests (3 new, total 1295 passing):
+default_theme_preserves_rgb_precision
+light_theme_preserves_rgb_precision
+bookmark_jump_restores_both_line_and_column
kellito
a9a3507daf