fix: CodeRabbit review fixes for Layer 3 (missed by the #2 merge)

[Mhemd139]

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PR #2 was merged from a stale head — the review-fix commit e0f592a (pushed after CI green) was left out. This PR brings it into main.

Fixes from the CodeRabbit round:

• fingerprint() raises CovenantError (clean exit 2, no stack trace)
• _check_probes judges probes by probe_key identity, not tool name
• config: [judge] must be a table (ConfigError, not AttributeError)
• judge: reject non-boolean drift verdicts
• introspect: name the probe on a failed call_tool
• README: document the sample stored for --judge

🤖 Generated with Claude Code
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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 669e1ebe-fabc-420a-9dcb-ee72fd0cf4c4

📥 Commits

Reviewing files that changed from the base of the PR and between fff1cd3 and e0f592a.

📒 Files selected for processing (7)

• README.md
• covenant/cli.py
• covenant/config.py
• covenant/fingerprint.py
• covenant/introspect.py
• covenant/judge/__init__.py
• tests/test_fingerprint.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/layer3-behavioral-probes

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