feat(setup): offer Impeccable design skills install

[rlorenzo]

What

Extends setup so that, after the per-agent command/skill installs, it offers to install the Impeccable design skills for the selected tools it supports. Modeled on the existing gh agent-skill flow.

How

• impeccable_provider_id() maps this repo's internal tool names to Impeccable --providers ids: claude→claude, codex→codex, copilot→github. Antigravity has no Impeccable provider, so it returns empty and is skipped.
• configure_impeccable_skills() builds a de-duplicated --providers list from the user's selected tools and, on confirm (default No), runs:

  npx impeccable install --providers=<list> --scope=global
  

• If only Antigravity is selected, the whole section is skipped silently (no empty install command).

Install vs update

It always runs install rather than a separate update command. Because it runs via npx (latest each time) with explicit --providers/--scope (Impeccable's idempotent, scriptable path), re-running setup refreshes an existing install and adds any newly-selected agents. No detect-and-update branch is added, because there is no clean, install-method-agnostic way to detect a per-provider install (e.g. Claude's Impeccable can arrive via /plugin, not npx), and always calling install is the better idempotent choice. The prompt wording and README document this.

Verification

• bash -n setup passes.
• Provider-list logic tested standalone across mixed / dedup / Antigravity-only selections.
• Pre-commit hooks pass: shellcheck, markdownlint, BATS unit tests.
• No existing tests reference the setup functions touched.

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• setup

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📝 Walkthrough

Walkthrough

Adds optional Impeccable design-skill installation to setup, wires it into the main install flow, and documents the supported provider behavior and manual commands in README.md.

Changes

Impeccable Skill Installation

Layer / File(s)	Summary
Provider mapping and installer function setup	Adds impeccable_provider_id() for supported tool-to-provider mapping and configure_impeccable_skills() to deduplicate providers, prompt for installation, verify npx, and run npx impeccable install --providers=... --scope=global.
Main flow wiring and documentation setup, README.md	Calls the Impeccable installer after the gh agent skill step and adds README coverage for supported providers, rerun behavior, Antigravity skipping, and manual install/update commands.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the new Impeccable install flow added to setup.
Description check	✅ Passed	The description matches the PR by explaining the new Impeccable install step and its behavior.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[rlorenzo]

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• README.md
• setup

[rlorenzo]

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