echo/hooks formatting

[flyingrobots]

• core: split math module into focused submodules
• Apply suggestions from code review
• docs: update execution plan + decision log for PR core: split math module into focused submodules #5 (core math split)
• docs(math): document clamp panic/NaN semantics; clarify EPSILON as degeneracy threshold\ndocs(prng): document zero-state guard in from_seed and panic in next_int\ndocs(quat): expand multiply() docs; add From<[f32;4]> docs\ndocs(vec3): add From<[f32;3]> docs; tighten normalize() docs\ntests(prng): replace brittle golden tests with property-based checks; keep optional golden behind feature flag
• fix(ci): add optional feature to rmg-core and fix doctest to avoid Vec3 unit constants\n\n- Resolve unexpected_cfgs error under -D warnings in CI\n- Update multiply() doctest to use Vec3::from arrays
• Update crates/rmg-core/src/math/vec3.rs
• Update crates/rmg-core/src/math/quat.rs
• docs(quat): correct composition order in multiply() docs; expand identity() and to_mat4() documentation; clarify to_array() order; add debug asserts to new()\nfix: replace let-chains in motion_executor for toolchain compatibility\nchore: set edition=2021 for rmg-core/ffi/wasm/cli
• style: reorder math imports and fmt to satisfy rustfmt; adjust rmg-ffi/wasm import order
• ci: add PRNG golden regression step to CI; fix doc/clippy nits around PRNG_ALGO_VERSION and doc formatting
• chore(hooks): add .githooks/pre-commit to couple PRNG algorithm/version with golden vector; add Makefile target 'hooks' to install core.hooksPath
• chore: add .editorconfig and pre-commit rustfmt check (opt-in via make hooks)

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📥 Commits

Reviewing files that changed from the base of the PR and between b1a9383 and 7a7b578.

📒 Files selected for processing (4)

• .editorconfig (1 hunks)
• .githooks/pre-commit (1 hunks)
• docs/decision-log.md (3 hunks)
• docs/execution-plan.md (1 hunks)

✨ Finishing touches

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• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch echo/hooks-formatting

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