feat: add Auggie (Augment Code) as first-class RTK agent

[augmentmoogi]

Summary

Adds Auggie (Augment Code) as a first-class RTK agent, matching the existing Claude, Cursor, Gemini, and Copilot integrations.

What this PR does

• AgentTarget::Auggie — extends the agent enum
• rtk hook auggie — new subcommand that processes PreToolUse payloads (reuses Claude's payload processor since the JSON schema matches: tool_input.command)
• rtk init --agent auggie — installs a PreToolUse hook into ~/.augment/settings.json with matcher launch-process
• rtk init --agent auggie --uninstall — cleanly removes the hook
• hooks/auggie/ — hook script and README
• Documentation — updated hooks/README.md, top-level README.md, supported-agents.md, src/hooks/README.md
• 15 unit tests — payload processing, install/uninstall, idempotency, JSON structure validation

How it works

The hook registers in ~/.augment/settings.json:

{
  "hooks": {
    "PreToolUse": [{
      "matcher": "launch-process",
      "hooks": [{ "type": "command", "command": "rtk hook auggie" }]
    }]
  }
}

When Augment fires a launch-process tool call, RTK intercepts the payload, rewrites supported commands (e.g. git status → rtk git status), and returns the rewrite via hookSpecificOutput.updatedInput.

Augment updatedInput status

Augment's PreToolUse hook system currently supports permissionDecision: "deny" but updatedInput is not yet implemented on Augment's side (docs reference). This means the RTK integration is fully ready and correct, but command rewriting will activate once Augment ships updatedInput support in a future release. No changes will be needed on RTK's side — it will just start working.

I'm coordinating with the Augment team and will update them once this is in a stable RTK release so they can update their docs accordingly.

Testing

• All 1744 tests pass (cargo fmt && cargo clippy && cargo test)
• Manual verification: hook payload processing confirmed working with real Augment PreToolUse payloads
• No new clippy warnings introduced

Files changed (10)

File	Change
src/main.rs	Added AgentTarget::Auggie, HookCommands::Auggie, routing
src/hooks/hook_cmd.rs	run_auggie + 8 tests
src/hooks/init.rs	Install/show/uninstall + 7 tests
src/hooks/constants.rs	AUGGIE_HOOK_COMMAND, AUGMENT_DIR
hooks/auggie/rtk-rewrite.sh	Hook script
hooks/auggie/README.md	Hook documentation
hooks/README.md	Added Auggie entry
README.md	Added to Supported Agents table
docs/guide/getting-started/supported-agents.md	Added Auggie row
src/hooks/README.md	Added to mode table

---

Pull Request opened by Augment Code with guidance from the PR author

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you all sign our Contributor License Agreement before we can accept your contribution.
1 out of 3 committers have signed the CLA.

✅ augmentmoogi
❌ github-actions[bot]
❌ rtk-release-bot[bot]
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[rtk-release-bot]

Automatic message from CI checks : It seems like this branche is targeting the wrong branch, any contribution should target develop branch.

See CONTRIBUTING.md for details.