Duplicate AIQ and RAG samples after the use-case restructure

After the reorganization in #14 and #15, two samples exist as full copies under both agentic/ and industry-solutions/:

• agentic/oke/aiq/aiq-2.0 and industry-solutions/oke/aiq/aiq-2.0 are byte-identical except for the cd path in the README and one trailing newline in deploy/terraform/modules/network/main.tf. The root README links both copies under "Agentic" and "Industry Solutions".
• agentic/oke/rag and industry-solutions/oke/rag are byte-identical. Neither copy is linked from the root README.

Keeping two full copies means they will drift (the Terraform module already differs by a line), and the same fix has to be made twice.

Suggested fix, whichever you prefer:

1. Keep one canonical copy (say under agentic/, since AIQ and RAG are agentic patterns) and, if you still want them discoverable under Industry Solutions, replace the second copy with a short README that links to the canonical one, or just cross-link from the root README.
2. Point both root-README entries at the single canonical path.

Happy to send the PR once you decide which location should be canonical; didn't want to delete a directory from the restructure without your call.

Start with the root README and compare the paired paths agentic/oke/aiq/aiq-2.0, industry-solutions/oke/aiq/aiq-2.0, agentic/oke/rag, and industry-solutions/oke/rag. Confirm the maintainer's canonical location before changing anything; done means one full copy remains, duplicate links or directories are replaced with links as decided, and the Terraform files no longer drift.