## ADDED Requirements

### Requirement: IAssembler abstraction with no native dependency

WhiteMagic SHALL define an `IAssembler` seam that produces machine code, with a default backend that has no native or third-party dependency. FASM MUST NOT be referenced by the default configuration.

#### Scenario: default backend is dependency-free
- **WHEN** WhiteMagic is built in its default configuration
- **THEN** no reference to FASM or `ManagedFasm` MUST be present in the output

#### Scenario: backend is replaceable
- **WHEN** an alternate `IAssembler` implementation is supplied
- **THEN** execution and injection MUST use it without other code changes

### Requirement: Hand-emitted calling-convention stubs

The default `StubAssembler` SHALL emit call trampolines for the cdecl, stdcall, thiscall, and fastcall conventions — pushing/placing arguments, calling the target, cleaning the stack per convention, and returning — for both x86 and x64 targets.

#### Scenario: cdecl stub encoding
- **WHEN** a cdecl call stub for a function with N 4-byte arguments is emitted (x86)
- **THEN** the bytes MUST push the arguments in reverse order, `call` the target, `add esp, N*4`, and `ret`

#### Scenario: stdcall omits caller cleanup
- **WHEN** a stdcall stub is emitted
- **THEN** it MUST NOT emit a caller-side stack cleanup (the callee cleans)

#### Scenario: x64 uses register argument order
- **WHEN** an x64 call stub is emitted
- **THEN** the first integer arguments MUST be placed in the platform argument registers before the call

### Requirement: Byte emitter primitives

`StubAssembler` SHALL provide little-endian emit primitives (`EmitU8`, `EmitU32`, `EmitU64`) used to hand-assemble stubs deterministically.

#### Scenario: little-endian 32-bit emit
- **WHEN** `EmitU32(0x11223344)` is called
- **THEN** the appended bytes MUST be `[0x44, 0x33, 0x22, 0x11]`

### Requirement: Optional Iced backend for arbitrary assembly

WhiteMagic SHALL provide an optional `IcedAssembler` backend that assembles arbitrary x86/x64 mnemonic text to machine code for callers who require runtime text assembly.

#### Scenario: arbitrary mnemonics assembled
- **WHEN** the Iced backend assembles `"push 0\nadd esp, 4\nret"` at a given origin
- **THEN** it MUST return the corresponding machine code bytes

#### Scenario: origin-relative encoding
- **WHEN** assembly containing a relative jump is assembled at a specified origin address
- **THEN** the encoded relative offsets MUST be correct for that origin