Make Python bindings the default build

[mgaitan]

Summary

• Make the Python bindings the default Cargo build, so maturin develop and release builds no longer need -F python.
• Align package and Cargo metadata with mgaitan/tl-parser, including README, documentation, and project URLs.
• Add AGENTS.md with repository guidance focused on the Python binding and maturin workflow.
• Update the Python binding loops and an existing test so the default PyO3 build passes the Rust checks.

Validation

• cargo fmt --check
• cargo test (74 unit tests and 10 doctests)
• cargo clippy --workspace --all-targets -- -D warnings
• uv run --group dev --with 'maturin>=1.5,<2.0' maturin develop
• uv run --group dev pytest (5 passed)
• maturin build --release without feature flags

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