fix(security): exclude Brigade state by default

[solomonneas]

What changed

• Default security scans to .brigade/** exclusion, including missing configs and newly generated configs.
• Preserve an explicit exclude_paths = [] opt-in.
• Reject unknown top-level keys and unknown keys in [suppressions] and [enrichment].
• Keep [suppression_reasons] open for fingerprint keys.

Root cause

include_paths and exclude_paths were supported, parsed, and preserved. The scanner glob matcher treated ** as a literal prefix. Commit 55da125, already on main, corrected the scanner walk. This PR completes issue #529 by making Brigade state excluded by default and by rejecting config typos instead of accepting no-op keys.

No fingerprint-generation or suppression-matching code changed. That work remains scoped to issue #530.

Validation

• brigade work verify run --target . --command "PY=$HOME/repos/brigade/.venv/bin ./scripts/verify" --capture brigade-work
• Receipt: 20260726-190042-work-verify-51fd4f
• Exit code: 0
• Scratch repro built a center report, rescanned, and returned no .brigade/ scanned files or findings.
• Unknown key exclude_pathz returned exit code 2.

Closes #529

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