fix(cli): load Atomic Chat as bundled plugin

[markijbema]

Summary

Load the Atomic Chat integration through the CLI's internal plugin lifecycle and keep its configuration marker out of external plugin origins. This prevents bundled CLI builds from falling back to the unpublished @kilocode/plugin-atomic-chat@latest npm package.

Atomic Chat package identifiers, versions, and npm aliases are recognized as the bundled integration, while similarly named file plugins and reverse aliases remain external. This preserves explicit plugin configuration without duplicate initialization or network installation.

Fixes #11256.

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (7 files)

• .changeset/load-bundled-atomic-chat.md
• packages/opencode/src/kilocode/atomic-chat-feature.ts
• packages/opencode/src/kilocode/config/default-plugins.ts
• packages/opencode/src/plugin/index.ts
• packages/opencode/test/config/config.test.ts
• packages/opencode/test/kilocode/config/atomic-chat-default-plugin.test.ts
• packages/plugin-atomic-chat/src/plugin/index.ts

Previous Review Summary (commit 4436139)

Current summary above is authoritative. Previous snapshots are kept for context only.

Previous review (commit 4436139)

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• .changeset/load-bundled-atomic-chat.md
• packages/opencode/src/kilocode/atomic-chat-feature.ts
• packages/opencode/src/kilocode/config/default-plugins.ts
• packages/opencode/src/plugin/index.ts
• packages/opencode/test/kilocode/config/atomic-chat-default-plugin.test.ts

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_{Review guidance: REVIEW.md from base branch main}