fix(deepseek): find pnpm when installing the terminal profile, and install it with dsh

src/config/cli-registry/stock.ts

@@ -1259,8 +1259,10 @@ const DEEPSEEK: CliEntry = {
     launcherTargetParam: 'profile',
     install: {
       command: {
-        linux: 'npm install -g @deepseek-ai/dsh',
-        darwin: 'npm install -g @deepseek-ai/dsh',
+        // pnpm rides along: `dsh plugin` spawns a literal `pnpm` with no npm fallback, so the
+        // terminal profile this CLI needs before it can run cannot be installed without it (#352).
+        linux: 'npm install -g @deepseek-ai/dsh pnpm',
+        darwin: 'npm install -g @deepseek-ai/dsh pnpm',
       },
       npmPackage: '@deepseek-ai/dsh',
       docsUrl: 'https://github.com/deepseek-ai/deepseek-harness',

src/utils/deepseek-cli-resolver.ts

@@ -84,7 +84,7 @@ export const DEEPSEEK_VERSION_REGEX = /(?:^|\s)v?(\d+\.\d+\.\d+(?:-[0-9A-Za-z][0
  */
 export const DEEPSEEK_IDENTITY_REGEX = /DeepSeek\s+Harness/i;
 
-const DEEPSEEK_NOT_FOUND = 'DeepSeek Harness CLI (dsh) not found. Install with: npm install -g @deepseek-ai/dsh';
+const DEEPSEEK_NOT_FOUND = 'DeepSeek Harness CLI (dsh) not found. Install with: npm install -g @deepseek-ai/dsh pnpm';
 
 /** Where profiles live: `$DSH_HOME/profiles`, defaulting to `~/.dsh/profiles`. */
 export function resolveDshHome(): string {

src/web/public/session-ui.js

@@ -92,7 +92,7 @@ const RUN_MODE_LAUNCH = {
   },
   deepseek: {
     label: 'DeepSeek',
-    installHint: 'DeepSeek Harness CLI (dsh) not found. Install with: npm install -g @deepseek-ai/dsh',
+    installHint: 'DeepSeek Harness CLI (dsh) not found. Install with: npm install -g @deepseek-ai/dsh pnpm',
     // The two-part availability check is deliberate. `dsh` being installed is
     // not enough — DeepSeek ships no terminal front door, so a box can have a
     // perfect binary and nothing a pane can run.

src/web/routes/system-routes.ts

@@ -617,13 +617,16 @@ export function registerSystemRoutes(
           // synchronous-spawn precedent this endpoint is modelled on.
           detached: true,
           // Inherit the environment: this needs a HOME to resolve $DSH_HOME
-          // against, and a PATH carrying `pnpm`. ⚠️ `dsh plugin` does NOT bundle a
+          // against, and a PATH carrying `pnpm` (see the PATH below). ⚠️ `dsh plugin` does NOT bundle a
           // package manager — it `spawnSync`s a literal `pnpm` with no npm
           // fallback, so on a host without one this exits 127 and dsh's own
           // stderr ("pnpm not found on PATH") is what reaches the caller through
           // the OPERATION_FAILED detail below. That is the same missing
           // dependency that broke the docker agent image in issue #352.
-          env: process.env,
+          // PATH leads with the directory `dsh` itself resolved to: CLI management installs
+          // `dsh` and `pnpm` into the user prefix (`~/.local/bin`), which a service's own PATH
+          // usually lacks, so `dsh plugin` could not find the `pnpm` sitting next to it.
+          env: { ...process.env, PATH: [dir, process.env.PATH].filter(Boolean).join(':') },
         });
       } catch (err) {
         resolve({ code: null, output: `spawn failed: ${getErrorMessage(err)}`, timedOut: false });