fix: interpolate output paths in completion logs

[johnjheejin]

Summary

• interpolate the generated HTML viewer path in its completion log
• interpolate the generated AI context guide path in its completion log
• add CLI regression coverage for both resolved paths and the escaped placeholder

Root cause

The two template literals escaped ${outPath}, so the CLI printed the placeholder text instead of each generated artifact's absolute path.

User impact

Completion logs now point directly to index.html and ai_context_guide.txt, making the generated artifacts easy to locate.

Latest-base update

• rebased onto upstream main at f02a53e
• adapted the regression test to the current executable-config gate

Validation

• npm ci --ignore-scripts --no-audit --no-fund
• npm test (20 tests: 19 passed, 1 skipped because symlink creation is unavailable on Windows)
• node --check quarkify.mjs
• git diff --check