Add red TUI init logo

[rlaope]

Summary

• Add a red LOOP ASCII init logo to the interactive no-arg TUI startup path.
• Keep the logo helper internal and leave renderTuiHome(snapshot) logo-free.
• Honor NO_COLOR, FORCE_COLOR=0, and TERM=dumb for TUI color output.
• Add regression coverage for colored startup, no-color startup, and one-time logo rendering across refresh.

Review

• Code-review lane: APPROVE, 0 issues.
• Architecture lane: CLEAR, no blockers.
• Performance review: renderTuiHome benchmarked at about 1.48 microseconds per render over 100,000 iterations; the logo is rendered only once on startup.

Verification

• node --test test/tui.test.js
• npm run verify
• git diff --check main..HEAD