feat: expose automation through MCP tools

[ScriptedAlchemy]

Stack

This is PR 2 of 5 replacing #114. It stacks on #127; review this PR against split/self-improving-01-backend-foundation.

Summary

• Exposes self-improving automation capabilities through MCP server/tool definitions.
• Adds skill/session handler support for automation-related operations.
• Extends MCP tests for the new tool surface and server behavior.

Verification

• cargo fmt --all -- --check
• git diff --check
• CI on the original equivalent tip was green before splitting.

Replaces part of #114.

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