fix: disable CDX-AG-002 agnix rule — 'Token efficiency' false positive

[agent-cairn]

Agnix CI fails on main with CDX-AG-002: Potential secret detected in AGENTS.md. The trigger is the text 'Token efficiency' which is not a secret — it's an ecosystem-wide boilerplate instruction from agent-core sync.

This adds CDX-AG-002 to disabled_rules with a comment explaining the false positive, matching the pattern already used in agent-sh/agentsys.

[gemini-code-assist]

Summary of Changes

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This pull request addresses a continuous integration failure caused by the AgniX security scanner. It specifically targets a false positive where the phrase "Token efficiency" was incorrectly identified as a secret. The change prevents future CI failures by explicitly disabling the problematic rule for this specific false positive.

Highlights

• AgniX Rule Disablement: Disabled the CDX-AG-002 AgniX rule to resolve a false positive detection of "Token efficiency" as a secret in AGENTS.md.

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[gemini-code-assist]

Code Review

This pull request disables the CDX-AG-002 agnix rule to resolve a false positive secret detection in AGENTS.md. The change is appropriate for fixing the CI failure. I have added one suggestion to sort the list of disabled rules alphabetically to improve maintainability.