Agents: include runtime shell (#1835)

* Agents: include runtime shell

* Agents: fix compact runtime build

* chore: fix CLAUDE.md formatting, security regex for secret

---------

Co-authored-by: Tak hoffman <takayukihoffman@gmail.com>
Co-authored-by: quotentiroler <max.nussbaumer@maxhealth.tech>

src/agents/shell-utils.ts

@@ -67,6 +67,63 @@ function resolveShellFromPath(name: string): string | undefined {
   return undefined;
 }
 
+function normalizeShellName(value: string): string {
+  const trimmed = value.trim();
+  if (!trimmed) {
+    return "";
+  }
+  return path
+    .basename(trimmed)
+    .replace(/\.(exe|cmd|bat)$/i, "")
+    .replace(/[^a-zA-Z0-9_-]/g, "");
+}
+
+export function detectRuntimeShell(): string | undefined {
+  const overrideShell = process.env.CLAWDBOT_SHELL?.trim();
+  if (overrideShell) {
+    const name = normalizeShellName(overrideShell);
+    if (name) {
+      return name;
+    }
+  }
+
+  if (process.platform === "win32") {
+    if (process.env.POWERSHELL_DISTRIBUTION_CHANNEL) {
+      return "pwsh";
+    }
+    return "powershell";
+  }
+
+  const envShell = process.env.SHELL?.trim();
+  if (envShell) {
+    const name = normalizeShellName(envShell);
+    if (name) {
+      return name;
+    }
+  }
+
+  if (process.env.POWERSHELL_DISTRIBUTION_CHANNEL) {
+    return "pwsh";
+  }
+  if (process.env.BASH_VERSION) {
+    return "bash";
+  }
+  if (process.env.ZSH_VERSION) {
+    return "zsh";
+  }
+  if (process.env.FISH_VERSION) {
+    return "fish";
+  }
+  if (process.env.KSH_VERSION) {
+    return "ksh";
+  }
+  if (process.env.NU_VERSION || process.env.NUSHELL_VERSION) {
+    return "nu";
+  }
+
+  return undefined;
+}
+
 export function sanitizeBinaryOutput(text: string): string {
   const scrubbed = text.replace(/[\p{Format}\p{Surrogate}]/gu, "");
   if (!scrubbed) {