docs(coding-agent): correct js-debug runtime + extraction path per review

Two wording fixes for PR #7759 review:
- debug.md no longer requires `node` on PATH; documents that the adapter
  runs under node if available, else the omp Bun host, matching
  resolveDefaultJsDebugAdapter()'s process.execPath fallback.
- The unavailable message and CHANGELOG now say "extract under
  ~/.local/opt" (not "to ~/.local/opt/js-debug/"), so the archive's
  js-debug/src/dapDebugServer.js lands at the auto-discovered path
  instead of one directory too deep.

Refs #7757.

docs/tools/debug.md

@@ -330,7 +330,7 @@ Example `.omp/dap.json`:
 
 ## Notes
 - `packages/coding-agent/src/prompts/tools/debug.md` tells the model only one active root session is supported. Adapter-requested child sessions belong to that root tree.
-- The default JavaScript/TypeScript adapter runs vscode-js-debug's `dapDebugServer.js` over TCP. It is **not** an npm package — `npm i -g js-debug-adapter` 404s (`js-debug-adapter` is the omp adapter id, not an installable package). Install `dapDebugServer.js` (requires `node` on `PATH`) one of these ways; the first two are auto-discovered by `resolveJsDebugServerPath()` in `packages/coding-agent/src/dap/config.ts`:
+- The default JavaScript/TypeScript adapter runs vscode-js-debug's `dapDebugServer.js` over TCP. It is **not** an npm package — `npm i -g js-debug-adapter` 404s (`js-debug-adapter` is the omp adapter id, not an installable package). Install `dapDebugServer.js` one of these ways; the first two are auto-discovered by `resolveJsDebugServerPath()` in `packages/coding-agent/src/dap/config.ts`:
   - Mason (`:MasonInstall js-debug-adapter`) → discovered at `~/.local/share/nvim/mason/packages/js-debug-adapter/js-debug/src/dapDebugServer.js`.
   - Standalone release tarball, extracted so `dapDebugServer.js` lands at `~/.local/opt/js-debug/src/dapDebugServer.js`:
     ```sh
@@ -340,6 +340,7 @@ Example `.omp/dap.json`:
     ```
     Replace `v1.117.0` with the latest tag from the [releases page](https://github.com/microsoft/vscode-js-debug/releases).
   - Any other location via `JS_DEBUG_DAP_SERVER=<path-to-dapDebugServer.js>`.
+- The adapter runs under `node` if on `PATH`, otherwise under the omp host (Bun); `resolveDefaultJsDebugAdapter()` falls back to `process.execPath`, so a Bun-only setup is supported.
 - `configurationDone` is sent automatically during root and child launch/attach handshakes and lazily before later requests if the initial handshake did not complete.
 - `startDebugging` reverse requests create recursive child sessions on the same TCP server; a stopped child becomes the target for thread-level actions.
 - `output` exposes the active session’s merged `output` event stream only; the tool does not distinguish stdout, stderr, and console categories.

packages/coding-agent/CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ### Changed
 
-- Clarified the JavaScript/TypeScript debug adapter install path: `js-debug-adapter` is the omp adapter id, not an npm package, so `npm i -g js-debug-adapter` 404s. The docs and the "adapter not available" message now point to the supported installs — Mason, the standalone release tarball extracted to `~/.local/opt/js-debug/` (auto-discovered), or `JS_DEBUG_DAP_SERVER` ([#7757](https://github.com/can1357/oh-my-pi/issues/7757)).
+- Clarified the JavaScript/TypeScript debug adapter install path: `js-debug-adapter` is the omp adapter id, not an npm package, so `npm i -g js-debug-adapter` 404s. The docs and the "adapter not available" message now point to the supported installs — Mason, the standalone release tarball extracted under `~/.local/opt` (auto-discovered), or `JS_DEBUG_DAP_SERVER`. The docs also note the adapter runs under `node` if available, else the omp Bun host ([#7757](https://github.com/can1357/oh-my-pi/issues/7757)).
 
 ## [17.2.9] - 2026-08-05
 

packages/coding-agent/src/tools/debug.ts

@@ -505,7 +505,7 @@ const ADAPTER_UNAVAILABLE_MESSAGES: Readonly<Record<string, string>> = {
 	dlv: "adapter 'dlv' is not available: install with 'go install github.com/go-delve/delve/cmd/dlv@latest'",
 	rdbg: "adapter 'rdbg' is not available: install with 'gem install debug'",
 	"js-debug-adapter":
-		"adapter 'js-debug-adapter' is not available: vscode-js-debug is not an npm package — install via Mason (`:MasonInstall js-debug-adapter`), extract the release tarball (https://github.com/microsoft/vscode-js-debug/releases) to ~/.local/opt/js-debug/, or set JS_DEBUG_DAP_SERVER to dapDebugServer.js",
+		"adapter 'js-debug-adapter' is not available: vscode-js-debug is not an npm package — install via Mason (`:MasonInstall js-debug-adapter`), extract the release tarball (https://github.com/microsoft/vscode-js-debug/releases) under ~/.local/opt, or set JS_DEBUG_DAP_SERVER to dapDebugServer.js",
 };
 
 const ADAPTER_CANONICAL_COMMANDS: Readonly<Record<string, string>> = {