feat!: remove the sample-generic compatibility layer and reach idsp p…

[leftger]

…arity

Breaking (targeting 0.6):

• Delete the width-suffixed instance aliases and thin wrappers; call the generic API and PidInstance::process directly. See MIGRATING.md.
• Move the duplicate filtering::Dsm / filtering::XorShift32 onto their dedicated modules.

Added:

• Validating audio-EQ builder (EqFilter / EqShape / BiquadType / EqError) covering every RBJ response including IHo, plus WebAudioFilter; coefficients bit-checked against idsp.
• embedded-dsp-ffi: C ABI (staticlib + cdylib) with a hand-maintained header and a C smoke test.
• embedded-dsp-py: PyO3 abi3 bindings with a Python smoke test.
• MIGRATING.md, licenses inside the published crate.

Tooling and refactors:

• Split filtering into family submodules and consolidate the test suite.
• CI: Miri, differential fuzz + always-on randomized differential test, cargo-hack, cargo-machete, scheduled cargo-mutants; un-gate publish dry-run.

[codecov]

Codecov Report

❌ Patch coverage is 89.81545% with 149 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
crates/embedded-dsp/src/filtering/biquad.rs	86.59%	48 Missing ⚠️
crates/embedded-dsp/src/filter_design.rs	77.38%	45 Missing ⚠️
crates/embedded-dsp/src/filtering/lockin.rs	61.01%	23 Missing ⚠️
crates/embedded-dsp/src/filtering/adaptive.rs	90.41%	14 Missing ⚠️
crates/embedded-dsp/src/filtering/normal_form.rs	89.28%	6 Missing ⚠️
crates/embedded-dsp/src/filtering/fir.rs	97.34%	5 Missing ⚠️
crates/embedded-dsp/src/filtering/convolution.rs	98.32%	4 Missing ⚠️
crates/embedded-dsp/src/filtering/int_filters.rs	88.88%	3 Missing ⚠️
crates/embedded-dsp/src/filtering/recursive.rs	98.98%	1 Missing ⚠️

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