chore: license the project under Apache-2.0

[dortort]

What

Adopt Apache-2.0 as the project license.

Why Apache-2.0

• Mirrors Playwright, Agentry's north-star model (also Apache-2.0).
• Explicit patent grant + retaliation clause — meaningful protection for a tool that intercepts LLM/MCP wire traffic and drives agent CLIs, at zero cost to adoption.
• Permissive core keeps a future hosted/cloud layer possible as a separate proprietary product.

Changes

• Add the canonical Apache-2.0 LICENSE and a NOTICE at the repo root.
• Add LICENSE + NOTICE to each of the seven publishable packages (@agentry/core, /claude, /codex, /gemini, /antigravity, /mcp, and the agentry CLI) so every published tarball carries its license (Apache-2.0 §4(d)).
• Declare the SPDX "license": "Apache-2.0" field on the root and all seven package manifests (they previously had none — i.e. all-rights-reserved by default).
• Point the README ## License section at the LICENSE.
• Remove the now-settled licensing item from the ROADMAP open-questions list.

This is independent of the Changesets release pipeline (#2) and based directly on main.

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