pvKernel 0.0.2 — CPU Exception Foundation

[0.0.2] - 2026-08-01

Added

• Modular kernel source layout (arch, drivers, graphics, halt).
• A kernel-owned Global Descriptor Table (GDT).
• A kernel-owned Task State Segment (TSS).
• A dedicated Interrupt Stack Table stack for double faults.
• A kernel-owned Interrupt Descriptor Table (IDT).
• Exception handlers for breakpoint, invalid opcode, general protection
  fault, page fault (with CR2 diagnostics), and double fault.
• A controlled int3 boot-time verification of the breakpoint handler.
• An optional page-fault test behind the fault-tests Cargo feature.
• GitHub Actions CI running cargo fmt --all -- --check and cargo build.
• Project-specific contribution, code of conduct, architecture, roadmap,
  dependency, build, and debugging documentation.

Changed

• Serial logging moved into a dedicated driver module with kprint!/
  kprintln! macros.
• Kernel initialization order: interrupts disabled, then GDT/TSS, then IDT,
  then framebuffer, then the controlled breakpoint test.
• Added spin as a kernel dependency for static, no_std-safe descriptor
  table storage.