fix: scope local warning to openclaw-only + improve spawn skill docs (#3074)

- Revert local security warning to openclaw-only (was blocking all agents)
- Update spawn skill to document how to run prompts on child VMs:
  - Always use `bash -lc` (binaries in ~/.local/bin/ need login shell)
  - Claude uses `-p` not `--print` or `--headless`
  - Add `--dangerously-skip-permissions` for unattended child VMs
  - Don't waste tokens with `which`/`find` or creating non-root users
- Sync all on-disk skill files with embedded version

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

skills/opencode/AGENTS.md

@@ -2,27 +2,40 @@
 
 You have the `spawn` CLI installed. Use it to provision cloud VMs with AI agents.
 
-## Usage
+## Provision a Child VM
 
 ```bash
 spawn <agent> <cloud> --headless --output json --prompt "task description"
 ```
 
-## Agents: claude, codex, openclaw, zeroclaw, opencode, kilocode, hermes, junie
-## Clouds: hetzner, digitalocean, aws, gcp, sprite
-
-## Example
-
-```bash
-spawn claude hetzner --headless --output json --prompt "Implement the auth module"
-```
+**Agents:** claude, codex, openclaw, zeroclaw, opencode, kilocode, hermes, junie
+**Clouds:** hetzner, digitalocean, aws, gcp, sprite
 
 Returns JSON: `{"status":"success","ip_address":"...","ssh_user":"root","server_id":"..."}`
 
+## Running Prompts on Child VMs
+
+`--headless` only provisions — to run work on the child, SSH in with `bash -lc`:
+
+```bash
+# Claude Code (use -p, NOT --print or --headless)
+ssh -o StrictHostKeyChecking=accept-new root@<ip> "bash -lc 'claude -p --dangerously-skip-permissions \"your prompt\"'"
+
+# Codex CLI
+ssh -o StrictHostKeyChecking=accept-new root@<ip> "bash -lc 'codex --quiet \"your prompt\"'"
+```
+
+### IMPORTANT — do NOT waste tokens rediscovering these:
+- **Always use `bash -lc`** — agent binaries are in `~/.local/bin/` which is only on PATH in login shells
+- **Claude uses `-p`** for non-interactive output (NOT `--print`, NOT `--headless`)
+- **Add `--dangerously-skip-permissions`** to skip approval prompts on child VMs
+- **Never try `which claude` or `find`** to locate binaries — they are always at `~/.local/bin/<agent>`
+- **Never create non-root users** to work around permission issues — just use `-p`
+
 ## Managing Children
 
 - `spawn list --json` — see running children
-- `spawn delete --name <name> --yes` — tear down a child VM
+- `spawn delete --name <name> --yes` — tear down a child VM (headless)
 - `spawn tree` — see the full spawn tree
 
 ## Context
@@ -30,3 +43,4 @@ Returns JSON: `{"status":"success","ip_address":"...","ssh_user":"root","server_
 - You are running inside a spawned VM (SPAWN_DEPTH is set)
 - Cloud credentials are pre-configured — no auth prompts
 - OpenRouter billing is shared with the parent
+