chore: add Amp orb setup/resume scripts

[undivisible]

Why

Fresh Amp orbs did not have a committed .agents/setup / .agents/resume, so agents had to install rustup by hand.

What

• Add idempotent .agents/setup (apt packages if missing, rustup stable + rustfmt/clippy/rust-src, cargo fetch --locked for in-cli).
• Add fast .agents/resume that only checks rustc/cargo.
• Ignore .amp/portals/.

Cold setup ~19s in this orb; warm setup ~0.3s after PATH includes ~/.cargo/bin. Resume ~0s.

Does not change compiler behavior. Safe to merge independently of the package-install security PR.

---

Note

Low Risk
Developer-environment and gitignore-only changes; no application runtime, auth, or compiler behavior changes.

Overview
Adds Amp orb lifecycle scripts so fresh environments get Rust without manual rustup steps.

.agents/setup is an idempotent inauguration script: installs missing apt deps (build-essential, pkg-config, curl, ca-certificates), installs/configures rustup stable with rustfmt, clippy, and rust-src, appends a one-time .bash_profile hook to source ~/.cargo/env, and runs cargo fetch --locked for in-cli when Cargo.lock exists. Steps are timed via a small step() helper.

.agents/resume is a fast path that only sources cargo env and fails fast if rustc/cargo are missing (directing users to run setup). It does not install packages.

.gitignore now ignores local .amp/portals/.

^{Reviewed by Cursor Bugbot for commit 8674283. Configure here.}

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(requestId: serverGenReqId_90f015a1-5b1b-4942-854a-1ad8085f8fab)

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