feat: builtin subagents

[uinstinct]

Description

Add 2 builtin subagents: navigator and code reviewer.

• is added automatically only when anthropic provider is present with a local api key
• also fix tool calls hung in subagent
• fix nested subagent execution
• put subagent tool out of beta

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Checklist

• [] I've read the contributing guide
• [] The relevant docs, if any, have been updated or created
• [] The relevant tests, if any, have been updated or created

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Tests

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Summary by cubic

Adds built-in Navigator and Code Reviewer subagents (auto-added when using Anthropic with a local API key) and enables the subagent tool by default. Fixes tool call results in subagents and prevents nested subagent execution.

• New Features

  • Built-in subagents: navigator and code-reviewer; included when Anthropic has a direct API key.
  • Subagent tool is always on; removes the --beta-subagent-tool flag.
  • Clearer subagent tool description and listing of available subagents.

• Bug Fixes

  • Tool calls no longer hang in subagents; results are written to chat history even without ChatHistoryService.
  • Blocks nested subagent invocation and returns a clear error.

^{Written for commit e19a8b1. Summary will update on new commits.}

[cubic-dev-ai]

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