v0.2.0: deep-dive voicing pass, M2 preset system, DE localisation, app icon

[yves-vogl]

Summary

This is the v0.2.0 release wave: a research-derived voicing revision, the suite's first implementation of the M2 preset system (Nave as pilot), a German frame-string localisation, and the app icon wired into the built binaries.

Deep-dive voicing pass (docs/design-brief.md, docs/research-notes.md)

• Distance's low-shelf taper is now front-loaded, replacing the v0.1 plain-linear-in-dB scaling with an "ease-out" power curve (1 - (1 - normalisedDistance)^1.8), matching the documented "accelerates then saturates" shape of real proximity effect. The high-shelf deliberately keeps its linear taper (see docs/architecture.md's "v0.2.0 Distance taper" note for why that asymmetry is intentional, not an oversight). This is a parameter-behavior-breaking change pre-1.0 — same Distance range/default, different curve; no state migration needed (see CHANGELOG.md).
• Manual/architecture/README copy replaces the "air-absorption darkening" framing with a directivity-first explanation.
• LoCut/HiCut's wider-than-NadIR ranges (20-800 Hz / 2-20 kHz) are now documented as a deliberate keep, with a named regression test guarding the four range constants.
• Manual now flags that Convolution::Normalise::yes is an energy normalisation, not a perceptual loudness match, and points at Level as the fix.

M2 preset system (.scaffold/specs/preset-system-m2.md, binding suite-wide spec)

• src/presets/PresetManager — factory presets (embedded via BinaryData), user presets (disk), load/save/rename/delete, dirty-state tracking, prev/next navigation, single-file and zip-bank import/export, user-preset-wins-over-factory default resolution.
• src/presets/PresetBar — the editor strip ([<] [Name*] [>] [Save] [Save As...] [Delete] [Import...] [Export...]), docked at the top of the existing v0.1/v0.2 layout.
• 8 factory presets (presets/factory/*.json, documented one-line-each in docs/presets.md).
• German localisation (resources/i18n/de.txt) for PresetBar's frame strings only — parameter/DSP terminology is never translated.
• Written with no Nave-specific coupling beyond a small PresetManagerConfig/FactoryPresetAsset surface — docs/preset-system-notes.md is the replication recipe for the other 11 plugins.

App icon

ICON_BIG "docs/assets/icon.png" added to juce_add_plugin(...) — verified embedded in the built AU/VST3/Standalone locally (AppIcon.icns present in each bundle's Contents/Resources/).

Fix-wave commits folded in

Commits merged after the v0.1.0 tag that never got their own release are now honestly summarised in CHANGELOG.md's [0.2.0] section: PR #18's audio-thread-safety/robustness fixes (#12, #13), a signed-release CI workflow (#10), and branding/copy housekeeping (#9, #14, #15, #17).

Test plan

• cmake -B build -G Ninja -DCMAKE_BUILD_TYPE=Debug (JUCE 8.0.14 + Catch2 v3.15.2 via CPM, CPM_SOURCE_CACHE shared cache)
• cmake --build build --target Tests Nave_Standalone --parallel 4 — clean build, no warnings
• ctest --test-dir build --output-on-failure — 73/73 tests green (up from 50: +2 from the already-merged PR fix: resolve review findings (audio-thread safety, robustness) #18, +3 Distance-taper/range-guard tests, +16 preset-system tests, +2 net from other coverage additions)
• cmake --build build --target Nave_VST3 Nave_AU — both formats build and embed the app icon locally
• Verified tests/PresetManagerTests.cpp never touches the real ~/Library/Audio/Presets/... directory on the dev machine (test-only directory override + post-test confirmation the real path was never created)
• CI (macOS + Windows, pluginval strictness 10 + auval) — pending this PR

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