fix(framework): replace hardcoded npx with a <runner> placeholder in skills #1044

Summary: Several shipped skills hardcode npx in their commands; users on alternative Node runners (pnpx, bunx, nubx, pnpm dlx, …) cannot run them.

🌟 Objective / Problem

Skills under plugins/ invoke npx directly. On machines where npx is not installed — increasingly common with alternative Node toolchains — the affected skills fail. Example: 01-acceptance-qa requires resolving npx as a prerequisite, so the whole QA flow is blocked on such machines.

Affected locations (found by grepping the shipped plugins for npx):

• plugins/aidd-qa/skills/01-acceptance-qa/references/interface-browser-playwright-cli.md — 6 occurrences, e.g. npx --yes @playwright/[email protected] -s=qa-<run-id> <command>
• plugins/aidd-qa/skills/01-acceptance-qa/actions/02-prerequisites.md — 2 occurrences (the check resolves npx and runs npx --yes @playwright/[email protected] --version)
• plugins/aidd-context/skills/12-cook/assets/recipes/mcp-installation.md — 1 occurrence (npx playwright)

🛠️ Proposed Solution

1. Replace every hardcoded npx in skill content with a <runner> placeholder, meaning "any package runner: npx, pnpx, bunx, nubx, pnpm dlx, …".
2. State the convention once at the top of each affected file, e.g.: <runner> is your package runner: npx, pnpx, bunx, nubx, …
3. In the 01-acceptance-qa prerequisites check, resolve whichever runner is available instead of requiring npx specifically.

🔍 Context / Technical Constraints (Optional)

• Out of scope: historical records under aidd_docs/tasks/ and the CLI install docs (cli/README.md), where npx @ai-driven-dev/cli@latest setup is the canonical npm install path.

🙏 QA

Validation must be done with an alternative package runner (pnpx, bunx, nubx, pnpm dlx, …) — not with npm/npx.

• No hardcoded npx remains in the shipped skills under plugins/
• Each file that uses <runner> defines the placeholder once
• 01-acceptance-qa prerequisites pass on a machine where npx is absent, resolving an alternative runner instead
• The 01-acceptance-qa flow runs end to end through an alternative runner (pnpx, bunx or nubx) and produces its evidence videos