feat: xorg viewer scale modes, resize fix, arch notes
Scale modes (STRETCH/FIT/FILL/1:1) with CENTER/TOP_LEFT anchor:
- UV crop via u_uv_scale/u_uv_offset uniforms in vertex shader
- glViewport sub-rect + glClear for FIT and 1:1 modes
- xorg_viewer_set_scale() / xorg_viewer_set_anchor() setters
- Stub implementations for both
Resize fix: glfwSetWindowUserPointer + framebuffer_size_callback calls
render() synchronously during resize so image tracks window edge
immediately. Forward declaration added to fix implicit decl error.
Q/Escape close the window via key_callback.
xorg_cli: --scale and --anchor arguments added.
architecture.md:
- Scale mode table and anchor docs in Frame Viewer Sink section
- Render loop design note: frame-driven not timer-driven, resize callback
rationale, threading note (GL context ownership, frame queue)
- Text overlay section: tier 1 bitmap atlas (Pillow build tool, skyline
packing, quad rendering), tier 2 HarfBuzz+FreeType, migration path
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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