Adopt the language intelligence compiler revision

[konojunya]

Summary

• update the exact stack-compiler source pin to the revision that implements the language-intelligence 1.0 contract
• keep Engine, formatter, native tests, and browser WebAssembly builds on one compiler revision

Verification

• cargo fmt --check
• cargo test --workspace --locked
• canonical formatter and Engine conformance suites
• cargo clippy --workspace --all-targets --all-features --locked -- -D warnings
• RUSTDOCFLAGS=-Dwarnings cargo doc --workspace --no-deps --locked
• SVG validation
• browser WebAssembly build, tests, typecheck, and package inspection
• unit coverage: lines 97.54%, functions 96.05%, regions 95.43%