docs: add troubleshooting page

Covers providers showing "Not installed", the login-shell/PATH
mismatch behind agents and terminals not seeing your commands, and
restarting the daemon after config changes.

public-docs/troubleshooting.md

@@ -0,0 +1,91 @@
+---
+title: Troubleshooting
+description: Why Paseo can't find a provider you've installed, and how to fix the PATH and environment mismatches behind most setup issues.
+nav: Troubleshooting
+order: 50
+category: Troubleshooting
+---
+
+# Troubleshooting
+
+Almost every "it works in my terminal but not in Paseo" problem is the same thing: Paseo and your terminal aren't searching the same `PATH`. This page covers how to spot that and fix it.
+
+## Paseo can't find my provider
+
+A provider you've installed shows as **Not installed**.
+
+Paseo launches the agent CLIs you've already installed, it doesn't bundle them (see [Providers](/docs/providers)). So it has to find the command on its own `PATH`. If your shell only adds that location to `PATH` under certain conditions, Paseo can miss it.
+
+### See what Paseo sees
+
+Open **Settings → your host → Providers**, tap the provider, then tap **Diagnostic**. The rows that matter:
+
+- **Resolved path** — where Paseo found the binary, or `not found`.
+- **Daemon PATH** — the `PATH` Paseo is searching. Compare it to `echo $PATH` in a fresh terminal.
+- **Version** — whether the binary actually runs.
+
+`not found` together with a **Daemon PATH** that's missing your binary's directory is the common case: that directory is on your terminal's `PATH` but not on Paseo's.
+
+### Fix it
+
+The durable fix is to make sure the command is on `PATH` for a normal login shell, then restart Paseo, see [why Paseo's environment can differ](#why-paseos-environment-can-differ-from-your-terminal) for why that's the test that matters.
+
+If you'd rather pin it directly, set the binary path in `~/.paseo/config.json`:
+
+```json
+{
+  "agents": {
+    "providers": {
+      "claude": {
+        "command": ["/absolute/path/to/claude"]
+      }
+    }
+  }
+}
+```
+
+`command` is `[binary, ...args]` and fully replaces the default launch command for that provider. Find the real path with `which -a claude`. `type -a claude` also tells you if `claude` is only a shell alias or function, those won't work, Paseo runs the binary directly, so use the path it points to. Restart the daemon after editing (see [below](#i-changed-configjson-but-nothing-happened)).
+
+For alternative endpoints, multiple profiles, custom binaries, and ACP agents, see [Custom providers](/docs/custom-providers). For per-agent install links, see [Supported providers](/docs/supported-providers).
+
+## Why Paseo's environment can differ from your terminal
+
+The same mismatch shows up anywhere Paseo runs your tools, an agent, or a terminal, reporting `command not found` for something you use every day.
+
+When you open the **desktop app** from the Dock or Finder, the OS hands it a stripped-down environment, not your terminal's `PATH`. To compensate, Paseo runs your login shell once at startup (`$SHELL -i -l -c`), captures its environment, and hands that to the daemon and everything it spawns. The rule of thumb: **if a brand-new terminal can run the command, Paseo should too.** That's also the test, open a fresh terminal and try it there.
+
+When you start the daemon yourself from a terminal (`paseo`), there's no login-shell step, it simply inherits that terminal's environment.
+
+Either way, the fix for a missing tool lives in your shell config (`.zshrc`, `.zprofile`, …), not in Paseo. Tools installed through version managers (asdf, mise, nvm, …) are the usual offenders, make sure they initialize for a clean login shell, not only inside one you've already opened.
+
+This login-shell step runs on macOS and Linux. On Windows, Paseo uses the environment it was launched with.
+
+## Reading the logs
+
+- **Desktop app** — the login-shell resolution is logged here. Look for `[login-shell-env]`: `applied` means it worked (it logs the `PATH` before and after); `failed; keeping inherited env` means it fell back to the stripped-down environment, with a `reason` (a timeout, a non-zero exit from your shell config, no output, …). A slow or erroring `.zshrc`/`.zprofile` is the usual cause.
+- **Daemon** — `~/.paseo/daemon.log` (`$PASEO_HOME/daemon.log` if you've set a custom home).
+
+Desktop app log location:
+
+| Platform | Path                            |
+| -------- | ------------------------------- |
+| macOS    | `~/Library/Logs/Paseo/main.log` |
+| Linux    | `~/.config/Paseo/logs/main.log` |
+| Windows  | `%APPDATA%\Paseo\logs\main.log` |
+
+## I changed config.json but nothing happened
+
+`config.json` is read when the daemon starts. Restart it after editing:
+
+```bash
+paseo daemon restart
+```
+
+Or in the app, open **Settings → your host → Host** and use **Restart daemon**. Running agents keep going, and clients reconnect automatically.
+
+## Still stuck?
+
+- [Custom providers](/docs/custom-providers) — endpoints, profiles, binaries, ACP agents.
+- [Configuration](/docs/configuration) — `config.json`, environment variables, logging.
+- [How Paseo resolves your login shell](https://github.com/getpaseo/paseo/blob/main/packages/desktop/src/login-shell-env.ts) — the exact code that loads your shell environment.
+- [Report an issue](https://github.com/getpaseo/paseo/issues).