Add release notes

releases/0.1.0-unoptimized.txt

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+the baseline: one draw call per entity, pure and simple
+
+- individual rl.drawCircle() calls in a loop
+- ~5k entities at 60fps before frame times tank
+- linear scaling: 10k = ~43ms, 20k = ~77ms
+- render-bound (update loop stays under 1ms even at 30k)
+- each circle is its own GPU draw call
+- the starting point for optimization experiments

releases/0.2.0-texture_blitting.txt

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+pre-render once, blit many: 10x improvement
+
+- render circle to 16x16 texture at startup
+- drawTexture() per entity instead of drawCircle()
+- raylib batches same-texture draws internally
+- ~50k entities at 60fps
+- simple change, big win
+- still one function call per entity, but GPU work is batched

releases/0.3.0-quad_batching.txt

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+bypass the wrapper, go straight to rlgl: 2x more
+
+- skip drawTexture(), submit vertices directly via rl.gl
+- manually build quads: rlTexCoord2f + rlVertex2f per corner
+- rlBegin/rlEnd wraps the whole entity loop
+- ~100k entities at 60fps
+- eliminates per-call function overhead
+- vertices go straight to GPU buffer
+- 20x improvement over baseline

releases/0.3.1-batch_buffer.txt

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+bigger buffer, fewer flushes: squeezing out more headroom
+
+- increased raylib batch buffer from 8192 to 32768 vertices
+- ~140k entities at 60fps on i5-6500T
+- ~40% improvement over default buffer
+- fewer GPU flushes per frame
+- also added: release workflows for github and forgejo
+- added OPTIMIZATIONS.md documenting the journey
+- added README, UI panel with FPS display
+- heap allocated entity array to support 1 million entities
+- per-entity RGB colors

releases/0.4.0-gpu_instancing.txt

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+gpu instancing: a disappointing discovery
+
+- drawMeshInstanced() with per-entity transform matrices
+- ~150k entities at 60fps - barely better than rlgl batching
+- negligible improvement on integrated graphics
+- why it didn't help:
+  - integrated GPU shares system RAM (no PCIe transfer savings)
+  - 64-byte matrix per entity vs ~80 bytes for rlgl vertices
+  - bottleneck is memory bandwidth, not draw call overhead
+  - rlgl batching already minimizes draw calls effectively
+- orthographic camera setup for 2D-like rendering
+- heap-allocated transforms buffer (64MB too big for stack)
+- lesson learned: not all "advanced" techniques are wins

releases/0.5.0-ssbo_instancing.txt

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+ssbo breakthrough: 5x gain by shrinking the data
+
+- pack entity data (x, y, color) into 12-byte struct
+- upload via shader storage buffer object (SSBO)
+- ~700k entities at 60fps (i5-6500T / HD 530)
+- ~950k entities at ~57fps
+- 5x improvement over previous best
+- 140x total from baseline
+- why it works:
+  - 12 bytes vs 64 bytes (matrices) = 5.3x less bandwidth
+  - 12 bytes vs 80 bytes (rlgl vertices) = 6.7x less bandwidth
+  - no CPU-side matrix calculations
+  - GPU does NDC conversion and color unpacking
+- custom vertex/fragment shaders
+- single rlDrawVertexArrayInstanced() call for all entities
+- shaders embedded at build time
+- removed FPS cap, added optional vsync arg

releases/0.5.1-windows_build.txt

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+cross-platform release: adding windows to the party
+
+- updated github release workflow
+- builds for both linux and windows now
+- no code changes, just CI/CD work

releases/0.6.0-zoom_zoom.txt

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+zoom and pan: making millions of entities explorable
+
+- mouse wheel zoom
+- click and drag panning
+- orthographic camera transforms
+- memory panel showing entity buffer sizes
+- background draws immediately (no flicker)
+- tab key toggles UI panels
+- explained "lofivor" name in README (lo-fi survivor)
+- shader updated for zoom/pan transforms

releases/0.6.1-q_to_quit.txt

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+quick exit: zoom out then quit
+
+- q key first zooms out, second press quits
+- nice way to see the full entity field before closing
+- minor UI text fix

releases/0.7.0-compute_shader.txt

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+compute shader: moving physics to the GPU
+
+- entity position updates now run on GPU via compute shader
+- GPU-based RNG for entity velocity randomization
+- full simulation loop stays on GPU, no CPU roundtrip
+- new compute.zig module for shader management
+- GpuEntity struct with position, velocity, and color
+- tracy profiling integration
+- FPS display turns green (good) or red (bad)
+- added design docs for zoom/pan and compute shader work
+- cross-platform alignment fixes for shader data