Merge branch 'master' into worktree/dsh-arg-parser

Integrate the Commander adapter with master's `dsh web --workspace-root`
(workspace-aware session flow).

- args.ts: add `--workspace-root <path>` to the web subcommand; WebInvocation
  carries workspaceRoot.
- web.ts: keep the adapter-parsed signature, take (host, port, dev,
  workspaceRoot) and pass workspaceRoot through to AppCLIEntry (drop master's
  re-added parseArgs and CLI host/port validation — the schema owns those).
- bin.ts forwards invocation.workspaceRoot; args.spec + the Agent Note pair note
  the flag.

apps/cli/src/bin.ts

@@ -30,7 +30,7 @@ const invocation = parseDshArgs(process.argv.slice(2), readVersion())
 switch (invocation.mode) {
   case 'web': {
     const { runWeb } = await import('./web.ts')
-    await runWeb(invocation.host, invocation.port, invocation.dev)
+    await runWeb(invocation.host, invocation.port, invocation.dev, invocation.workspaceRoot)
     break
   }
   case 'headless': {