- Rename debug.rs → debug_info.rs in silverscript-lang (types-only module)
- Create debugger-session library crate (session runtime, presentation)
- Create cli-debugger binary crate (renamed from sil-debug)
- Migrate debug session tests and CLI smoke test to new crates
- Update all imports across workspace

…t-izio-port

feat(debugger): port debugger onto izio spanned-ast core

Bad merge resolution had reverted PR kaspanet#44 changes:
- Restore serialize_i64 instead of to_le_bytes+OpBin2Num for int fields
- Restore Ok(9) field chunk size (was incorrectly Ok(10))
- Remove spurious OpBin2Num injection in validate_output_state
- Update test expectations to match corrected encoding

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

- Remove constructor/constant names from env when they collide with
  function param names (prioritizing function parameters).
- Propagate caller's __arg_ bindings and params map into inline calls,
  allowing nested synthetic argument chains to resolve correctly.
- Extract magic string into pub const SYNTHETIC_ARG_PREFIX.
- Add regression tests for both fixes.

# Conflicts:
#	silverscript-lang/src/compiler.rs