Extend JamesDSP with convolution and spatial audio

frontend/vendor/jamesdsp/README.md

@@ -1,19 +1,17 @@
 # JamesDSP vendor files
 
-The WebAssembly engine, parameter table and browser adapter originate from
-`jamesdsp-web` revision `77be0b2e825a20ba98feff33d16dd0a43232ef3b`. Source is
-available in that repository and the underlying JamesDSPManager source is
-referenced by its `upstream/` tree. The runtime files remain in the lazy
-`feature:jamesdsp` asset group; license and provenance documents are not runtime
-assets.
+The browser port's worklet, 8–96 kHz streaming sample-rate adapter, matrix
+convolver, HRTF/virtual-speaker spatial stage, generated IRs and IndexedDB IR
+store are pinned to the source revision in VERSION.txt. Runtime files stay in
+the lazy `feature:jamesdsp` group. A user must enable the engine or choose
+“Download audio effects for offline” before the offline-completion job caches
+them, including the WASM binary.
 
-`jamesdsp-node.js` and `worklet.js` carry the integration changes described in
-`VERSION.txt`. The generated C engine and `params.js` are unchanged from the
-pinned revision. The Node wrapper intentionally rejects text-effect parameters
-and does not serialize text, preventing Liveprog/DDC/arbitrary text payloads
-from entering the v1 surface.
+The adapted wrapper resolves dependencies through `Lazy.url()` and routes the
+worklet through the existing AudioGraph. It rejects Liveprog, DDC and arbitrary
+text effects. Impulse responses are limited to 65,536 internal frames; lower-
+power devices use a 24,000-frame cap and warn before larger responses are used.
 
-The upstream `upstream/Main/LICENSE` text says GPL-2.0 while the port repository
-ships a GPL-3.0-or-later license. Both texts are retained as supplied. Confirm
-the upstream provenance and redistribution position before a public release;
-this note is not a legal conclusion.
+The port is GPL-3.0-or-later (`LICENSE.txt`). The upstream license snapshot says
+GPL-2.0; both supplied notices remain in this directory pending upstream
+clarification. See VERSION.txt for the adaptation record.