feat(bundle): color compiler diagnostics in Output

The runner now passes -fdiagnostics-color=always, since auto only sees a
pipe. src/ansi.js turns stderr's SGR sequences into bold and colored
runs, keeping style and cut-off sequences across chunks and dropping
other sequences such as gcc's erase-line. Program stdout stays verbatim.

Colors come from --vscode-terminal-ansi* variables. 2026 Dark leaves
them unset, so vendor/vscode/terminal-colors.json pins VS Code's dark
terminal defaults from the same upstream commit as the themes; a theme
value still wins.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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