chore: exclude agent tooling and the knowledge base from the kenkeep scan

JD Leonardrequested to merge
issue/entity_segment-3612924:3612924-exclude-agent-tooling into 1.0.x

.kkignore governs which markdown the kenkeep scan treats as project documentation. It excluded .ai/kenkeep/hooks/ and the harness skill directories, but not kenkeep's own prompt templates and README, the committed nodes/ tree, .claude/agents/, or the harness instruction files.

A bootstrap therefore ingested the tooling as if it were project docs, and — now that nodes/ is committed — would seed the knowledge base from itself.

.ai/kenkeep/ subsumes the narrower hooks/ entry. CLAUDE.md joins AGENTS.md because both are loaded into every session already, so nodes extracted from them would duplicate the always-on layer.

finddocs now lists only README.md, docs/*.md and the submodule READMEs.

Issue #3612924.

Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com

Closes #3612924

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