Unifies and extends breakpoint and debug trap handling

[Godones]

No description provided.

[Copilot]

Pull request overview

This PR unifies breakpoint handling across architectures and extends x86_64 trap handling to include #DB (debug) traps, enabling registration of trap handlers for both breakpoint and debug events.

Changes:

• Add BREAK_HANDLER and (x86_64-only) DEBUG_HANDLER distributed-slice trap hooks.
• Route breakpoint traps on aarch64/riscv/loongarch64/x86_64 through a shared handler mechanism.
• Introduce ExceptionKind::Debug (x86_64-only) and classify x86_64 debug exceptions accordingly.

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
src/x86_64/uspace.rs	Classify x86_64 debug exceptions as ExceptionKind::Debug.
src/x86_64/trap.rs	Add explicit handlers for #BP and #DB and route vectors to them.
src/uspace_common.rs	Add ExceptionKind::Debug behind cfg(target_arch = "x86_64").
src/trap.rs	Define new distributed-slice trap hooks for breakpoint/debug handlers.
src/riscv/trap.rs	Route breakpoint exceptions through BREAK_HANDLER with TrapFrame access.
src/loongarch64/trap.rs	Route breakpoint exceptions through BREAK_HANDLER with TrapFrame access.
src/aarch64/uspace.rs	Update breakpoint exception classification to match BRK/BKPT EC values.
src/aarch64/trap.rs	Route BRK handling through BREAK_HANDLER with PC adjustment logic centralized.

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