feat: v0.2.0 deep-dive rework, M2 preset system, i18n frame, housekeeping

[yves-vogl]

Summary

Deep-dive voicing rework (docs/design-brief.md, sourced in docs/research-notes.md) against the F6-class reference set (Waves F6, FabFilter Pro-Q 3/4, TDR Nova, Sonnox Oxford Dynamic EQ):

• Knee width now derives from Range (clamp(|rangeDb| * 0.5, 2, 10) dB), replacing v0.1.0's flat 6 dB constant. Reproduces the old fixed-6-dB knee shape exactly at Range = ±12 dB (deliberate, tested bit-compatible-in-shape special case).
• New per-band bN_autoRelease (off by default): program-dependent release. Detector gains a dedicated fast reference envelope (fixed fast release, independent of the user's own Release setting) whose recent dB fall rate derives an effective release that is always <= the manual Release value and shortens automatically when the signal is genuinely decaying on its own. Inspired by, not a reproduction of, Waves F6's proprietary ARC (documented in the brief's honesty section). An earlier implementation attempt derived the fall-rate measurement from the slow main envelope itself, which is self-referential and never actually sped anything up — see docs/architecture.md's new "program-dependent auto-release" section for the full writeup of that mistake and the fix.
• New per-band bN_gainQ (off by default): the main filter's own Q widens as the band's dynamic gain approaches Range (Sonnox-style analog softening), scoped away from the Detector's own sidechain selectivity to avoid a feedback loop.
• Attack range widened to 0.1–500 ms (was 0.5–100 ms); Release range widened to 5–1500 ms (was 10–1000 ms).
• Both new toggles default off; tolerant import verified (a v0.1.0 session loads with every existing value preserved exactly and the new IDs at their off default).

M2 preset system (src/presets/, copied verbatim from the basilica-audio/nave pilot per its replication recipe): PresetManager/PresetBar/Localisation, nine factory presets (docs/presets.md), German frame localisation (resources/i18n/de.txt — core DSP terminology never translated).

Housekeeping: app icon wired via ICON_BIG (this repo never got a patch release with it); .github/workflows/release.yml gets the suite-wide idempotent create-release job fix (this repo never got the earlier ci-fix PR); version bumped to 0.2.0.

No GUI changes for bN_autoRelease/bN_gainQ — deliberately deferred to M3 alongside the rest of the custom LookAndFeel pass, per the design brief's own scope note. Both remain fully automation/preset-controllable.

Test plan

• ctest — 87/87 green locally (Debug, Ninja, arm64 native): all 47 pre-existing v0.1.0 tests still pass unmodified in behavior (only range-boundary/count assertions updated to match the widened parameter layout), plus new coverage for every design-brief guarantee (feat: M1 dynamic EQ core, tests and docs #1–feat: v0.2.0 deep-dive rework, M2 preset system, i18n frame, housekeeping #7), the full M2 preset-system suite (16 cases, adapted from nave), i18n frame coverage, and a new permanent AllocationGuard/AllocationTests.cpp audio-thread allocation regression harness (extended to the auto-release and gain/Q-coupling code paths specifically).
• Lancet_Standalone builds clean (Debug, Ninja, arm64 native).
• CI (macOS + Windows matrix, pluginval strictness 10, auval) — will confirm green before merge.

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