Description

Severity: minor

Architect fails to render some emoji characters and shows empty space instead, while the same content renders correctly in Ghostty.

Affected emojis:
🌤️🎞️🗣️🖼️🎛️

Steps to Reproduce

Starting state: Architect and Ghostty are available on the same machine.

1. In Ghostty, run: printf '🌤️🎞️🗣️🖼️🎛️\n'
2. Confirm Ghostty renders all emojis correctly.
3. In Architect, run: printf '🌤️🎞️🗣️🖼️🎛️\n'
4. Compare output for the same emoji string.

Reproducibility: Always

Expected Behavior

Architect renders the same emoji characters as Ghostty, without dropping visible glyphs.

Actual Behavior

Architect renders some emojis as empty space (no visible glyph), including 🌤️, while Ghostty shows them correctly.

Suspected Area

Unicode/emoji text rendering pipeline, likely around terminal cell content to glyph shaping/rendering (for example src/render/renderer.zig and src/font.zig).

Acceptance Criteria

• If feasible: a regression test exists that reproduces this bug (fails before fix, passes after)
• The fix does not break existing tests
• If the fix changes documented behavior: docs/PRD.md is updated (if present)