Add MIT LICENSE file matching README copyright

[trippyogi]

Summary

• Add a root LICENSE with the standard MIT text and Copyright (c) 2026 Nous Research, matching the README claim and pyproject.toml license = {text = MIT}.
• Closes the GitHub license-detection gap described in Repository is missing LICENSE file (README claims MIT) #164.

Test plan

• Confirm LICENSE is present at repo root on this branch
• Confirm copyright year/holder match README (MIT — © 2026 Nous Research)
• After merge, verify gh api repos/NousResearch/hermes-agent-self-evolution/license returns SPDX MIT

Fixes #164

[TurtleMcTurtle]

Review: PR #166 — Add MIT LICENSE file

The repo's README states "MIT — © 2026 Nous Research" but there is no actual LICENSE file in the repo. This PR adds the standard MIT license text, which is needed for:

• GitHub to detect and display the license badge
• Legal clarity for contributors and users
• npm/PyPI package metadata compliance

The LICENSE text is standard MIT with "Copyright (c) 2026 Nous Research" which matches the README.

Suggestion: This is a straightforward housekeeping PR. Recommend merging — it adds something the repo genuinely needs.