perf(simulator): lazy-load source maps

[TekenujUi90]

Summary

• Defer DWARF/source-map parsing until the first source lookup.
• Initialize the parsed source map once per mapper and retain the existing lookup behavior.

Verification

• cargo test --lib source_mapper::tests — 8 passed.
• cargo fmt --manifest-path simulator/Cargo.toml -- --check — passed.
• git diff --check — passed.

Fixes #1936

[vercel]

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[TekenujUi90]

@dotandev @TekenujUi90 This PR isolates the lazy source-map parsing change as requested and references only Fixes #1936. It touches only simulator/src/source_mapper.rs (commit d121c524). Focused source-mapper Rust tests are running; I will update with their result.

[zeemscript]

@dotandev @TekenujUi90 Final verification: cargo test --lib source_mapper::tests passed (8 tests), cargo fmt --manifest-path simulator/Cargo.toml -- --check passed, and git diff --check passed. GitHub shows only simulator/src/source_mapper.rs; the PR body references only Fixes #1936.

[dotandev]

do you mind checking your commit authors?

2 separate accounts? look into that.