Add TokenFence to Tools section

[u4ma-kev]

Hi! 👋

TokenFence is an open-source cost circuit breaker + runtime guardrails SDK for AI agents.

What it does:

• Per-workflow budget caps with automatic enforcement
• Automatic model downgrade (e.g., GPT-4o → GPT-4o-mini → GPT-3.5) as budget depletes
• Kill switch for runaway agent loops
• Least-privilege policy engine (allow/deny/require_approval with wildcards + audit trail)

Available as:

• Python SDK: PyPI (104 tests, zero deps)
• Node.js SDK: npm (58 tests, zero deps, full TypeScript)

Links:

• Website & docs: tokenfence.dev
• Python repo: u4ma-kev/tokenfence-python
• Node.js repo: u4ma-kev/tokenfence-node

MIT licensed. Fits naturally in the Tools section alongside AgentGuard, agentops, and APort Agent Guardrails.

[Jenqyang]

Decision: Not ready to merge yet.

Reason:

1. The current diff places the entry under Benchmark/Evaluator instead of Tools.
2. The linked Python repository in the PR body is not currently resolvable on GitHub, so the evidence trail is incomplete.

Next step: Please move the entry to the correct section and update the repo links to resolvable public repositories, then we can re-review.