fix: allow structured leaf nodes without children

[charleseze356]

What changed

Mark the children array optional for structured content nodes in the remnote_search and remnote_read_note output schemas. The property remains supported for non-leaf nodes.

Why

The RemNote bridge intentionally omits children for leaf nodes, but the MCP server output schema required it. Strict MCP clients therefore rejected otherwise valid large structured responses with a schema error.

Impact

• Leaf nodes without children now validate correctly.
• Nested nodes may still include children; recursive structured output is unchanged.
• Markdown output, input schemas, and RemNote write behavior are unaffected.
• Tools inheriting the search result schema receive the corrected contract.

Validation

• Full unit suite: 554 tests passed
• TypeScript typecheck passed
• Lint passed
• Formatting check passed
• Production build passed
• MCPB generated-metadata check passed
• Live RemNote server and bridge reconnected on v0.17.0, and a fresh Codex task advertised children? in the structured output schema

[gemini-code-assist]

Code Review

This pull request updates the output schemas for the remnote_search and remnote_read_note tools to mark the children array of structured content nodes as optional, matching bridge responses that omit children for leaf nodes. It also updates the schema descriptions, adds a unit test to verify this behavior, and documents the change in CHANGELOG.md. There are no review comments, so I have no feedback to provide.

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