Add unquantified check for vague answers to counting prompts

[HarshRajSinghania]

Summary

Adds a new unquantified check that flags results which answer a counting/listing prompt with a vague quantifier and no countable output.

Motivation

Fixes #41. A prompt such as "report every failing test as node ids" answered with "several hot paths worth investigating" currently produces no finding.

Implementation

check_unquantified in agentrace/checks.py:

• Fires only when the prompt looks like a count/list/enumerate request (report every, how many, enumerate, etc.).
• Skips if the result already has digits, markdown bullets, or table rows.
• Flags low severity when the result still uses a vague quantifier (several, some, a few, many, ...).

Registered next to the other checks in CHECKS. README table updated.

Testing

Ran locally:

python3 -m pytest tests/ -q

Result: 45 passed.

New tests cover the issue's two acceptance cases:

• counting prompt + "there are several issues" → flagged
• same prompt + "3 failing: a, b, c" → clean

[github-actions]

Welcome, @HarshRajSinghania, and thanks for your first pull request to Agentrace.

A quick look at CONTRIBUTING.md covers how things are set up and run here.

I'll review this shortly. Ask anything in the thread if something is unclear.

[github-actions]

Nice work @HarshRajSinghania, this is merged.

Good, focused change. Exactly the kind of thing Agentrace needs.

If Agentrace is useful to you, a star goes a long way.

Happy to see more from you whenever you have the time.