feat: add inference.sh integration (infsh tool + skill) (#1682)

Add inference.sh CLI (infsh) as a tool integration, giving agents
access to 150+ AI apps through a single CLI — image gen (FLUX, Reve,
Seedream), video (Veo, Wan, Seedance), LLMs, search (Tavily, Exa),
3D, avatar/lipsync, and more. One API key manages all services.

Tools:
- infsh: run any infsh CLI command (app list, app run, etc.)
- infsh_install: install the CLI if not present

Registered as an 'inference' toolset (opt-in, not in core tools).
Includes comprehensive skill docs with examples for all app categories.

Changes from original PR:
- NOT added to _HERMES_CORE_TOOLS (available via --toolsets inference)
- Added 12 tests covering tool registration, command execution,
  error handling, timeout, JSON parsing, and install flow

Inspired by PR #1021 by @okaris.

Co-authored-by: okaris <okaris@users.noreply.github.com>

skills/inference-sh/cli/references/cli-reference.md

@@ -0,0 +1,104 @@
+# CLI Reference
+
+## Installation
+
+```bash
+curl -fsSL https://cli.inference.sh | sh
+```
+
+## Global Commands
+
+| Command | Description |
+|---------|-------------|
+| `infsh help` | Show help |
+| `infsh version` | Show CLI version |
+| `infsh update` | Update CLI to latest |
+| `infsh login` | Authenticate |
+| `infsh me` | Show current user |
+
+## App Commands
+
+### Discovery
+
+| Command | Description |
+|---------|-------------|
+| `infsh app list` | List available apps |
+| `infsh app list --category <cat>` | Filter by category (image, video, audio, text, other) |
+| `infsh app search <query>` | Search apps |
+| `infsh app list --search <query>` | Search apps (flag form) |
+| `infsh app list --featured` | Show featured apps |
+| `infsh app list --new` | Sort by newest |
+| `infsh app list --page <n>` | Pagination |
+| `infsh app list -l` | Detailed table view |
+| `infsh app list --save <file>` | Save to JSON file |
+| `infsh app my` | List your deployed apps |
+| `infsh app get <app>` | Get app details |
+| `infsh app get <app> --json` | Get app details as JSON |
+
+### Execution
+
+| Command | Description |
+|---------|-------------|
+| `infsh app run <app> --input <file>` | Run app with input file |
+| `infsh app run <app> --input '<json>'` | Run with inline JSON |
+| `infsh app run <app> --input <file> --no-wait` | Run without waiting for completion |
+| `infsh app sample <app>` | Show sample input |
+| `infsh app sample <app> --save <file>` | Save sample to file |
+
+## Task Commands
+
+| Command | Description |
+|---------|-------------|
+| `infsh task get <task-id>` | Get task status and result |
+| `infsh task get <task-id> --json` | Get task as JSON |
+| `infsh task get <task-id> --save <file>` | Save task result to file |
+
+### Development
+
+| Command | Description |
+|---------|-------------|
+| `infsh app init` | Create new app (interactive) |
+| `infsh app init <name>` | Create new app with name |
+| `infsh app test --input <file>` | Test app locally |
+| `infsh app deploy` | Deploy app |
+| `infsh app deploy --dry-run` | Validate without deploying |
+| `infsh app pull <id>` | Pull app source |
+| `infsh app pull --all` | Pull all your apps |
+
+## Environment Variables
+
+| Variable | Description |
+|----------|-------------|
+| `INFSH_API_KEY` | API key (overrides config) |
+
+## Shell Completions
+
+```bash
+# Bash
+infsh completion bash > /etc/bash_completion.d/infsh
+
+# Zsh
+infsh completion zsh > "${fpath[1]}/_infsh"
+
+# Fish
+infsh completion fish > ~/.config/fish/completions/infsh.fish
+```
+
+## App Name Format
+
+Apps use the format `namespace/app-name`:
+
+- `falai/flux-dev-lora` - fal.ai's FLUX 2 Dev
+- `google/veo-3` - Google's Veo 3
+- `infsh/sdxl` - inference.sh's SDXL
+- `bytedance/seedance-1-5-pro` - ByteDance's Seedance
+- `xai/grok-imagine-image` - xAI's Grok
+
+Version pinning: `namespace/app-name@version`
+
+## Documentation
+
+- [CLI Setup](https://inference.sh/docs/extend/cli-setup) - Complete CLI installation guide
+- [Running Apps](https://inference.sh/docs/apps/running) - How to run apps via CLI
+- [Creating an App](https://inference.sh/docs/extend/creating-app) - Build your own apps
+- [Deploying](https://inference.sh/docs/extend/deploying) - Deploy apps to the cloud