v0.6.0-alpha.5

Major redesign of Rect internal storage and API cleanup, laying groundwork for v1.0.

Added

• Rect::new(x, y, width, height) — primary constructor matching game framework convention
• Rect::from_tl_size(Pos, Size) — renamed from Rect::new(Pos, Size)
• Rect::width_usize() / Rect::height_usize() — for indexing use
• Pos::cmp_row_major() — y-primary comparison for grid iteration
• impl Display for Size — formats as 10×20
• Type aliases: Pos16, PosI for positions, Rect16, RectI for rectangles
• Optional serde feature (serde = ["dep:serde"])
• cargo-semver-checks in CI
• Block layout, which stores data in continuous fixed-size (W x H) blocks
• AGENTS.md — guidelines for LLM contributors

Changed

• Rect internal storage changed from (l, t, r, b) to (x, y, w, h) — all fields are T
• Rect::width() and Rect::height() now return T (was usize)
• Rect::from_ltrb_unchecked() is no longer unsafe — uses debug_assert!
• Removed T: Int bound from Pos and Rect struct definitions (C-STRUCT-BOUNDS)
• Rect::new(Pos, Size) renamed to Rect::from_tl_size(Pos, Size)
• Layout has been split into 2 traits:
  • Layout for iterating over positions, rectangles, and elements
  • Linear for an (optional) optimization of linear-aligned data
• Layouts are now &self instead of static-only, allowing for dynamic dispatch
• License changed to MIT OR Apache-2.0 (was MIT)
• Lint configuration aligned with rg: added rust.nursery, must_use_candidate, more

Removed

• unsafe code from production codebase (forbid(unsafe_code))
• AsRef / AsMut impls on Pos (depended on unsafe pointer casts)
• Rect::iter_pos and related methods; use the layout traits instead
• .gemini/GEMINI.md — replaced by AGENTS.md