[docs] BACKLOG addedHEADmaster

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 # Backlog
 
 ## Patch
+
 > v1.1.2 - critical bug fixes
 
--[ ] Fix missing closing parenthesis in FBGL_F32RGBA_TO_U32 macro — currently fails to compile _bug_
--[ ] Fix fbgl_draw_line termination condition — breaks for lines with negative direction (right-to-left or bottom-to-top) _bug_
--[ ] Fix i_fbgl_sqrt_int — currently computes x*x (square) not sqrt, corrupting filled circle rendering _bug_
--[ ] Implement missing fbgl_clear — declared in header but has no definition; rename or alias from fbgl_set_bg _bug_
+- [ ] Fix missing closing parenthesis in `FBGL_F32RGBA_TO_U32` macro — currently fails to compile `bug`
+- [ ] Fix `fbgl_draw_line` termination condition — breaks for lines with negative direction (right-to-left or bottom-to-top) `bug`
+- [ ] Fix `i_fbgl_sqrt_int` — currently computes x\*x (square) not sqrt, corrupting filled circle rendering `bug`
+- [ ] Implement missing `fbgl_clear` — declared in header but has no definition; rename or alias from `fbgl_set_bg` `bug`
 
 ## Minor
+
 > v1.2.0 - input and window system
 
--[ ] Fix fbgl_is_key_pressed consuming the keypress via fbgl_get_key — peek without consuming _bug_
--[ ] Add mouse input support — position, left/right/middle button state _feat_
--[ ] Implement fbgl_window_t API — fbgl_window_create, fbgl_window_destroy, clipped drawing within window bounds _feat_
--[ ] Add line thickness parameter to fbgl_draw_line _feat_
--[ ] Add fbgl_draw_triangle_outline and fbgl_draw_triangle_filled _feat_
--[ ] Add fbgl_draw_ellipse_outline and fbgl_draw_ellipse_filled _feat_
--[ ] Add fbgl_draw_arc primitive _feat_
+- [ ] Fix `fbgl_is_key_pressed` consuming the keypress via `fbgl_get_key` — peek without consuming `bug`
+- [ ] Add mouse input support — position, left/right/middle button state `feat`
+- [ ] Implement `fbgl_window_t` API — `fbgl_window_create`, `fbgl_window_destroy`, clipped drawing within window bounds `feat`
+- [ ] Add line thickness parameter to `fbgl_draw_line` `feat`
+- [ ] Add `fbgl_draw_triangle_outline` and `fbgl_draw_triangle_filled` `feat`
+- [ ] Add `fbgl_draw_ellipse_outline` and `fbgl_draw_ellipse_filled` `feat`
+- [ ] Add `fbgl_draw_arc` primitive `feat`
 
 ## Minor
+
 > v1.3.0 - rendering quality
 
--[ ] Add double buffering — off-screen back buffer with explicit fbgl_swap_buffers to eliminate tearing _feat_
--[ ] Add alpha blending / compositing — partial transparency instead of binary draw-or-skip _feat_
--[ ] Add clipping region / scissor rect support _feat_
--[ ] Add scaled texture rendering — fbgl_draw_texture_scaled(fb, tex, x, y, w, h) _feat_
--[ ] Add PSF2 font support alongside existing PSF1feat
--[ ] Add polygon drawing — fbgl_draw_polygon_outline and fbgl_draw_polygon_filled with vertex array _feat_
+- [ ] Add double buffering — off-screen back buffer with explicit `fbgl_swap_buffers` to eliminate tearing `feat`
+- [ ] Add alpha blending / compositing — partial transparency instead of binary draw-or-skip `feat`
+- [ ] Add clipping region / scissor rect support `feat`
+- [ ] Add scaled texture rendering — `fbgl_draw_texture_scaled(fb, tex, x, y, w, h)` `feat`
+- [ ] Add PSF2 font support alongside existing PSF1 `feat`
+- [ ] Add polygon drawing — `fbgl_draw_polygon_outline` and `fbgl_draw_polygon_filled` with vertex array `feat`
 
 ## Minor
+
 > v1.4.0 - performance & dx
 
--[ ] Add thread safety — mutex guards on g_keyboard_state and previous_frame_time globals _dx_
--[ ] Batch pixel writes with memset / SIMD where applicable for fbgl_set_bg and filled shapes _perf_
--[ ] Add dirty-rect tracking — only flush changed regions to framebuffer _perf_
--[ ] Add FBGL_NO_MATH compile flag to explicitly opt out of math.h dependency _dx_
--[ ] Add comprehensive error code enum — replace magic -1 returns with named codes _dx_
--[ ] Add debug logging mode with FBGL_DEBUG flag covering all drawing functions, not just fbgl_set_bg _dx_
+- [ ] Add thread safety — mutex guards on `g_keyboard_state` and `previous_frame_time` globals `dx`
+- [ ] Batch pixel writes with `memset` / SIMD where applicable for `fbgl_set_bg` and filled shapes `perf`
+- [ ] Add dirty-rect tracking — only flush changed regions to framebuffer `perf`
+- [ ] Add `FBGL_NO_MATH` compile flag to explicitly opt out of `math.h` dependency `dx`
+- [ ] Add comprehensive error code enum — replace magic `-1` returns with named codes `dx`
+- [ ] Add debug logging mode with `FBGL_DEBUG` flag covering all drawing functions, not just `fbgl_set_bg` `dx`
 
 ## Major
+
 > v2.0.0 - multi-display & extended formats
 
--[ ] Multi-display support — manage multiple /dev/fbN devices simultaneously _feat_
--[ ] PNG texture loader alongside existing TGA — reduces external tooling dependency _feat_
--[ ] Sprite sheet / atlas support with UV rect selection _feat_
--[ ] TTF/BDF font rasterizer — remove hard dependency on PSF bitmap fonts _feat_
--[ ] Break fbgl_window_t into full sub-surface compositor with z-ordering _feat_
+- [ ] Multi-display support — manage multiple `/dev/fbN` devices simultaneously `feat`
+- [ ] PNG texture loader alongside existing TGA — reduces external tooling dependency `feat`
+- [ ] Sprite sheet / atlas support with UV rect selection `feat`
+- [ ] TTF/BDF font rasterizer — remove hard dependency on PSF bitmap fonts `feat`
+- [ ] Break `fbgl_window_t` into full sub-surface compositor with z-ordering `feat`