Spec 43: Chunk compiler

[noahbfreedman-cloud]

Summary

• add chunk compilation with ordering, stripping, deduplication, and budget trimming
• route hook chunk loading through the compiler
• add a compile CLI and compiler test coverage

Testing

• python3 -m pytest tests/test_compiler.py tests/test_hooks.py tests/test_tokens.py tests/test_export.py tests/test_regressions.py -q