Build context on what the codebase was meant to do #63

If we somehow had some sort of "wiki" representation of the code, this contextualization can help:

• Improve analysis results and reduce false positives in /security:analyze
• Serve as the basis of a threat model or attack scenarios

Steps:

• Magically create a "knowledge index" about the codebase
• Run benchmarks (possibly from Robust Gemini CLI PR scans #30) to see if it helps reduce false positives

Next steps would be to see how it can contribute to "threat modeling" efforts and also attack scenarios (#62)