feat: add Anvil sub anchor and Crucible resampler

Two new CLAP effects aimed at riddim and dubstep production, plus shared
crates so all four plugins keep one look and reuse DSP.

Anvil 0.1.0 (io.storyboard.sub-anchor):
- Replaces the band below Split with a clean mono sine. Every note gets
  the same peak level and restarts at the same phase, so switch-ups keep
  their weight and kick hits line up.
- Pitch and note starts come from the audio (YIN, 80 ms lookahead
  reported to the host) or from MIDI notes sent to the effect.
- Dynamics, Drive, Octave, Glide, Phase, Gate and Keep; Solo sub monitor,
  note readout, level meters and a low-band oscilloscope.

Crucible 0.1.0 (io.storyboard.resampler):
- Records its input continuously in a lock-free ring with host transport
  markers. Capture takes the newest 1-16 complete bars on the bar grid,
  following tempo changes, or the newest audio when stopped.
- Grid (straight and triplet) or transient slicing, manual cuts, slice
  audition without audio-thread allocation.
- Export writes the loop, trimmed, declicked and normalised slices named
  and tagged with their root note, and an optional 2048-sample wavetable
  for Serum and Vital.

Shared:
- common-ui holds the palette, fonts, knobs and panels taken from Patina;
  Patina renders identically. Rotary knobs at their minimum no longer
  tessellate a zero-length arc into NaN vertices.
- common-dsp holds biquads, a Linkwitz-Riley crossover, YIN, note helpers
  and a float WAV writer with sampler root and Serum frame chunks.
- Catalog, CI matrix, release tags, editor previews and docs cover both
  plugins; a script test keeps the catalog and workflows in step.

docs/development.md

@@ -12,7 +12,9 @@ licenses. Shared build/check/release tools consume it. Each wrapper's Cargo
 package version is the authoritative release version.
 
 The root workspace contains Rivet's core, MIDI, application, and offline preview
-crates, plus Patina's core, editor, and renderer. Wrappers under
+crates; Patina's core, editor, and renderer; Anvil's and Crucible's core and
+editor crates; and the shared `common-ui` (palette, fonts, knobs, panels) and
+`common-dsp` (filters, YIN pitch detection, WAV files) crates. Wrappers under
 `plugins/<product>/plugin/` remain independent workspaces because they depend on
 a pinned NIH-plug Git revision. Their host identities and persistence stay separate.
 
@@ -23,6 +25,8 @@ cargo test --workspace --locked
 cargo clippy --workspace --all-targets --locked -- -D warnings
 python scripts/check-plugin.py --plugin rivet
 python scripts/check-plugin.py --plugin patina
+python scripts/check-plugin.py --plugin anvil
+python scripts/check-plugin.py --plugin crucible
 python -m unittest discover -s scripts/tests -v
 ```
 
@@ -43,12 +47,14 @@ install the Rust `x86_64-pc-windows-gnu` target and MinGW's
 ```sh
 python scripts/build-plugin.py --plugin rivet --target x86_64-pc-windows-gnu
 python scripts/build-plugin.py --plugin patina --target x86_64-pc-windows-gnu
+python scripts/build-plugin.py --plugin anvil --target x86_64-pc-windows-gnu
+python scripts/build-plugin.py --plugin crucible --target x86_64-pc-windows-gnu
 python scripts/package-windows.py
 python scripts/package-windows.py --plugin rivet
 python scripts/package-windows.py --plugin patina
 ```
 
-Build outputs use `dist/<target>/Rivet.clap` and `Patina.clap`, with docs and
+Build outputs use `dist/<target>/<Name>.clap`, with docs and
 licenses retaining their directory structure. `CARGO_TARGET_DIR` is supported
 for sharing compilation between wrappers. MSVC packaging accepts
 `--target x86_64-pc-windows-msvc`.
@@ -69,6 +75,8 @@ cargo run --manifest-path tools/editor-check/Cargo.toml -- /tmp/rivet.png --plug
 cargo run --manifest-path tools/editor-check/Cargo.toml -- /tmp/rivet-creative.png --plugin rivet --creative
 cargo run --manifest-path tools/editor-check/Cargo.toml -- /tmp/patina.png --plugin patina
 cargo run --manifest-path tools/editor-check/Cargo.toml -- /tmp/patina-compact.png --plugin patina --compact
+cargo run --manifest-path tools/editor-check/Cargo.toml -- /tmp/anvil.png --plugin anvil
+cargo run --manifest-path tools/editor-check/Cargo.toml -- /tmp/crucible.png --plugin crucible
 ```
 
 Patina also accepts `--silent`, `--delta`, and `--bypass` as render fixtures.
@@ -82,6 +90,8 @@ artistic quality. Use the product guides for FL Studio acceptance checks.
 | --- | --- | --- |
 | Rivet | Motif Storyboard | `io.storyboard.motif` |
 | Patina | Resonance Compressor | `io.storyboard.resonance-compressor` |
+| Anvil | (new) | `io.storyboard.sub-anchor` |
+| Crucible | (new) | `io.storyboard.resampler` |
 
 Rivet retains `story-session-v1` and its session migration support; Patina retains
 all parameter IDs. No JSON/state migration is introduced by the rename. These