docs(readme): add hero banner

[lyonzin]

Adds the project hero banner to the top of the README.

• Commits the banner as assets/knowledge-rag-banner.png (renamed from the initial Knowledge-Rag.png upload to match lowercase-kebab convention and the README <img> reference — the mixed-case name would 404 on GitHub's case-sensitive renderer).
• Inserts a centered <p align="center"><img …></p> at the very top of the README, above the # knowledge-rag heading.

Docs/asset only — no code, no API-surface change.

Note: the banner art still reads "20 format parsers" while the repo now ships 35 (see #194 / #202). Kept as-is per owner decision; to be refreshed on the next banner revision.

Greptile Summary

Adds a centered project hero banner above the README title.

• References the new banner through a repository-relative, lowercase-kebab-case path.
• Adds the corresponding PNG under assets/.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
README.md	Adds centered markup referencing the new repository-local hero banner above the existing heading.
assets/knowledge-rag-banner.png	Adds the PNG banner referenced by the README.

_{Reviews (2): Last reviewed commit: "docs(readme): add hero banner + rename a..." | Re-trigger Greptile}

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 8b42bce8-7377-4ec1-9bf1-f4509808b72e

📥 Commits

Reviewing files that changed from the base of the PR and between 5405745 and b2ead57.

⛔ Files ignored due to path filters (1)

• assets/knowledge-rag-banner.png is excluded by !**/*.png

📒 Files selected for processing (1)

• README.md

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