docs: add JetBrains Junie, Amp, and Jules support (native AGENTS.md readers) (#326)

* docs: add JetBrains Junie support (native AGENTS.md reader)

Junie reads AGENTS.md from the project root natively (per JetBrains' official docs), so ponytail works zero-config in any JetBrains IDE — like CodeWhale (#124). Adds a README note + agent-portability row, and bumps the agent badge 16 -> 17. Docs-only.

* docs: also add Amp and Jules support (native AGENTS.md readers)

Amp (Sourcegraph) reads AGENTS.md as its primary guidance file (cwd + parents up to $HOME + global config; per ampcode.com/manual). Jules (Google) auto-reads AGENTS.md from the repo root (per jules.google/docs). Both work zero-config via the AGENTS.md this repo ships. Badge 17->19. Roo Code evaluated and excluded (archived 2026-05-15).

* Merge main; correct Junie AGENTS.md note (Guidelines Path, not automatic)

---------

Co-authored-by: Emeriko <dietrich.gebert@gmail.com>

Author: hamza-ali-shahjahan

README.md

@@ -15,7 +15,7 @@
   <img src="https://img.shields.io/github/stars/DietrichGebert/ponytail?style=flat-square&color=111111&label=stars" alt="Stars">
   <img src="https://img.shields.io/github/v/release/DietrichGebert/ponytail?style=flat-square&color=111111&label=release" alt="Release">
   <img src="https://img.shields.io/npm/v/@dietrichgebert/ponytail?style=flat-square&color=111111&label=npm" alt="npm">
-  <img src="https://img.shields.io/badge/works%20with-16%20agents-111111?style=flat-square" alt="Works with 16 agents">
+  <img src="https://img.shields.io/badge/works%20with-19%20agents-111111?style=flat-square" alt="Works with 19 agents">
   <img src="https://img.shields.io/badge/license-MIT-111111?style=flat-square" alt="MIT license">
 </p>
 
@@ -255,6 +255,12 @@ GitHub Copilot CLI fallback (instruction-only mode): it reads `AGENTS.md` and `.
 
 VS Code with the Codex extension reads `AGENTS.md`, which this repo ships, so it works from the repo root with no setup (`~/.codex/AGENTS.md` makes Codex global).
 
+JetBrains Junie can read `AGENTS.md` once you point it there in Settings → Tools → Junie → Project Settings → Guidelines Path (it is not automatic yet). This repo ships `AGENTS.md`; `.junie/guidelines.md` is Junie's legacy path.
+
+Amp (Sourcegraph) reads `AGENTS.md` from the working directory and parent directories up to `$HOME`, which this repo ships, so it works with no setup (`~/.config/amp/AGENTS.md` works globally).
+
+Jules (Google) reads `AGENTS.md` from the repository root, which this repo ships, so it picks up the ruleset with no setup.
+
 Which files map to which agent: [Agent portability](docs/agent-portability.md).
 
 ### Uninstall

docs/agent-portability.md

@@ -23,6 +23,9 @@ to load in a given agent.
 | CodeWhale | `AGENTS.md` | Reads `AGENTS.md` from the repo root as project instructions; also reads `CLAUDE.md` and `.claude/instructions.md` as fallbacks. Instruction-tier. |
 | Swival | `.swival/skills/`, `AGENTS.md` | `swival skills add https://github.com/DietrichGebert/ponytail` installs the six skills straight into `.swival/skills/`. Add `--global` to stage them in the library (`~/.config/swival/library`) first, then `swival skills add ponytail` (or `--global ponytail`) to activate per-project or everywhere. Also reads `AGENTS.md` from the repo root and `~/.config/swival/AGENTS.md` globally as instruction-tier fallback. |
 | VS Code + Codex extension | `AGENTS.md` | The Codex extension reads `AGENTS.md` (repo root, or `~/.codex/AGENTS.md` globally). Instruction-tier; the full Codex plugin row above adds `/ponytail` levels and hooks. |
+| JetBrains Junie | `AGENTS.md` | Junie reads `AGENTS.md` once you point it there in Settings → Tools → Junie → Project Settings → Guidelines Path (not automatic yet); this repo ships `AGENTS.md`, and `.junie/guidelines.md` is Junie's legacy path. Instruction-tier. |
+| Amp (Sourcegraph) | `AGENTS.md` | Amp reads `AGENTS.md` from the working directory and parent directories up to `$HOME` (plus global config like `~/.config/amp/AGENTS.md`); falls back to `AGENT.md`/`CLAUDE.md`. Instruction-tier. |
+| Jules (Google) | `AGENTS.md` | Jules automatically reads `AGENTS.md` from the repository root. Instruction-tier. |
 | Kiro | `.kiro/steering/ponytail.md` | Steering rule; copy globally or into a project. |
 | Zed | `AGENTS.md` | Auto-includes `AGENTS.md` from the worktree root as one of its default rule files for the Agent Panel. Instruction-tier. |
 | Generic agents | `AGENTS.md` or `skills/*/SKILL.md` | Copy the compact rule file or load the skill files directly. |