Add RELEASES.md with v0.2.0 entry

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# sigil-dsp Releases

## v0.2.0 — 2026-04-18

### Added

- **Karplus-Strong plucked string** primitive exposed through `(sigil dsp osc)`:

`make-ks freq decay excite-gain`, `ks-compute`, `ks-trigger!`,

`ks-set-freq!`, `ks-set-decay!`, `ks-set-excite-gain!`.

+10

Feedback delay-line physical model with a 2-tap averaging lowpass in

+11

the feedback path. Per-trip gain derived from the requested -60 dB

+12

decay time. Delay line is sized for the lowest supported fundamental

+13

(20 Hz) at creation, so retuning upward via `ks-set-freq!` is a

+14

pointer trick, not a realloc. Rising-edge gate retriggers

+15

excitation — callers driving a continuous gate can invoke

+16

`ks-trigger!` manually per note.

+17

+18

Exposed struct layout (`src/c/ks.h`) stays public so downstream

+19

render loops (motif) can pick up the node as a graph primitive.

+20

+21

## v0.1.0 — 2026-03-26

+22

+23

Initial release. SoundPipe-backed oscillators, filters, envelopes,

+24

effects, noise generators, and utility modules exposed through

+25

`(sigil dsp {core,osc,filter,env,fx,noise,util})`.