feat(registry): AssetResolver + diffuser supplier curves (Jäger / Aerostrip / PIK / PRK)

Two related changes bundled together because the diffuser curve files
only make sense once the registry namespace they live in exists.

src/registry — new asset-metadata resolver:
- AssetResolver with synchronous resolve(namespace, id) + lazy cache,
  async refresh() for future remote pulls.
- FileBackend (per-id or single-file layouts, case-insensitive) and a
  stub HttpBackend (disabled unless EVOLV_ASSET_REMOTE=1).
- Namespaces: curves, menu, monsterSamples, monsterSpecs, units. Menu
  namespace re-keys by inner softwareType + filename so editors that
  pass either string resolve to the same tree.
- README explains how to add a namespace.
- AssetCategoryManager (datasets/assetData/index.js) becomes a thin
  facade over the resolver so existing consumers don't move.
- 246/246 tests pass — including the 39-test registry suite.

datasets/assetData — file moves + new diffuser data:
- modelData/*.json deleted; curves/*.json is the canonical home.
- New diffuser.json menu tree with GVA, Jäger, Aquaconsult/Entec,
  PIK/PRK suppliers.
- gva-elastox-r.json migrated from the inline _loadSpecs hardcode,
  re-tagged coverageBasis="bottom-coverage-pct" (the legacy 2.4
  elements/m² was a prior mis-conversion; we can't recover the
  original % so it's a single-point curve under key "0").
- jaeger-jetflex-td-65-2-g-epdm-1000.json — extracted from the Jäger
  EPDM-1000mm SSOTE/DWP chart on the data sheet (vector-PDF read).
  SSOTE 8.20→6.40 %/m, DWP 25→48 mbar across Q 2-12 Nm³/h. Single
  coverage (vendor doesn't state test conditions).
- aerostrip-phoenix.json — 4-coverage SOTE family at 4.75 m water
  depth (DD 5/10/15/20 %, flux 10-70 Nm³/h·m²) from the Entec/de
  Winter 2023-11-22 dataset; DWP curve from the 21 % @ 4.05 m chart.
- pik300.json / prk300.json — 5-coverage SOTE + SSOTR (DD 5-25 %)
  with split DWP per model variant, water depth ≈ 4.0 m inferred from
  the SOTE↔SSOTR ratio in the source spreadsheet.

src/configs/diffuser.json:
- New asset.{model, assetTagNumber} block so the editor's selected
  model id survives validation.
- diffuser.density description corrected to "Bottom coverage [%]";
  default 2.4 → 15 (typical fine-bubble install).

src/configs/{rotatingMachine,valve}.json: small alignment edits that
came with the registry phase.

src/menu/asset.js + src/menu/aquonSamples.js: rewritten as facades
over assetResolver, keeping the editor-side cascade behaviour intact.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

index.js

@@ -30,8 +30,15 @@ const convert = require('./src/convert/index.js');
 const MenuManager = require('./src/menu/index.js');
 const { predict, interpolation } = require('./src/predict/index.js');
 const { PIDController, CascadePIDController, createPidController, createCascadePidController } = require('./src/pid/index.js');
-const { loadCurve } = require('./datasets/assetData/curves/index.js'); //deprecated replace with load model data
-const { loadModel } = require('./datasets/assetData/modelData/index.js');
+const { AssetResolver, FileBackend, HttpBackend, assetResolver } = require('./src/registry/index.js');
+
+// loadCurve(model) is now a thin shim over assetResolver.resolve('curves', model).
+// Same contract: sync, case-insensitive, returns null on miss. New code should
+// prefer `assetResolver.resolve('curves', ...)` directly; this shim is kept so
+// external consumers don't have to change in one go.
+function loadCurve(modelId) {
+    return assetResolver.resolve('curves', modelId);
+}
 const { POSITIONS, POSITION_VALUES, isValidPosition } = require('./src/constants/positions.js');
 const Fysics = require('./src/convert/fysics.js');
 
@@ -72,8 +79,7 @@ module.exports = {
     createPidController,
     createCascadePidController,
     childRegistrationUtils,
-    loadCurve, //deprecated replace with loadModel
-    loadModel,
+    loadCurve,
     gravity,
     POSITIONS,
     POSITION_VALUES,
@@ -90,5 +96,12 @@ module.exports = {
     createRegistry,
     CommandRegistry,
     BaseNodeAdapter,
-    stats
+    stats,
+    // Asset metadata registry (replaces loadCurve / AssetCategoryManager /
+    // ad-hoc JSON readers — see src/registry/README.md). Backend-swappable;
+    // sync at runtime by contract.
+    AssetResolver,
+    FileBackend,
+    HttpBackend,
+    assetResolver,
 };