Normalize .codc artifact paths for dotted units and reset PTAC register sequencing per artifact

[Copilot]

.codb entries inside project.codc were being keyed by raw unit name (e.g., test.lazyloop/...) instead of nested unit paths (test/lazyloop/...). This caused incorrect container layout for any dotted unit and inconsistent artifact path handling.

• Container + fallback path normalization

  • IRManager now normalizes unit names via a shared toUnitPath(...) (. → /) for:
    • .codc entry names
    • standalone .codb fallback file paths
  • This makes storage/loading consistent across all dotted units, not just lazyloop.

• Runner path output consistency

  • CommandRunner and TestRunner now use the same shared unit-path normalization for compile/debug artifact paths, so logs reflect actual container layout.

• Bytecode “register next” stability

  • Lowerer now resets internal temp/pattern/lambda counters at the start of each lower(...) call.
  • This ensures deterministic per-artifact register/symbol allocation instead of carrying counter state across compiles.

// Before: entry path built from raw unit name
return unit + "/" + className + ".codb";

// After: dotted units are normalized once and reused everywhere
return toUnitPath(unit) + "/" + className + ".codb";
// e.g. "test.lazyloop" -> "test/lazyloop"