Add assist plugin v0.1.12

[victorborshak]

Summary

Adds the assist plugin v0.1.12 to the CLI plugin index.

• Plugin: assist (AI agent design, coding, and deployment assistant)
• Version: 0.1.12
• Release: https://github.com/datarobot/dr-agent-cli/releases/tag/v0.1.12
• SHA256: a805691e814316a27ed2180132fae6e7aeb89e93cde016903d26718b868695c1

Test Plan

• dr plugin install assist installs successfully
• dr assist --help shows usage
• dr assist launches the agent UI

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Note

Low Risk
Low risk: this is a data-only update to the CLI plugin index, adding a new assist release entry with its download URL, checksum, and date.

Overview
Registers assist plugin v0.1.12 in docs/plugins/index.json, adding its tarball URL, sha256, and releaseDate ahead of prior versions so the CLI can discover/install the new release.

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