Rewrite amendable-cli in Rust

.github/workflows/ci.yml

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+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: rustfmt, clippy
+      - run: cargo fmt --check
+      - run: cargo clippy --all-targets -- -D warnings
+      - run: cargo test

.gitignore

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+/target
+**/*.rs.bk
+.idea/
+.vscode/
+*.swp
+.DS_Store

AGENTS.md

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+# Agent notes for amendable-cli
+
+Rust CLI (`amendable`) for the Amendable API.
+
+## Product facts (do not invent others)
+
+- Site + Git HTTPS: `https://amendable.io`
+- API: `https://api.amendable.io` header `access-token`
+- Clone: `https://amendable.io/r/<username>/<repo>.git`
+- Git password is the access token. There is no SSH.
+- Command name is `amendable`. Package name is `amendable-cli`.
+
+Staging is a config override, not a different command set:
+
+- `amendable --staging` / `amendable login --staging`
+- `AMENDABLE_API_URL=https://stage.api.amendable.io`
+- `AMENDABLE_APP_URL=https://stage.amendable.io`
+
+Config file: `~/.config/amendable/config.toml` (mode `0600`).
+
+Authoritative API behavior lives in `../amendable-web`. Customer docs live in `../amendable-docs`. If the CLI disagrees with the API, fix the CLI. If the docs disagree with the CLI, fix the docs.
+
+## Commands
+
+Keep the public command surface stable. Docs and examples call `amendable`, not `amendable-cli`.
+
+## Tests
+
+```bash
+cargo test
+cargo fmt --check
+cargo clippy --all-targets -- -D warnings
+```