## Why

`title` and `breadcrumb` now participate in embedding text, but that improvement only affects newly indexed vectors. We need a repeatable acceptance path that tells us how to reindex the knowledge base and verify live retrieval after the embedding input changes.

## What Changes

- Add a live RAG retrieval acceptance flow for breadcrumb-aware embedding changes.
- Document the reindex prerequisite so reviewers understand old vectors do not change automatically.
- Provide a small repeatable script for calling live retrieval cases and writing JSON/Markdown reports.
- Add interview-facing acceptance notes that explain what was verified and what remains manual or environment-dependent.

## Capabilities

### New Capabilities

None.

### Modified Capabilities

- `rag-retrieval-evaluation`: Extend retrieval evaluation with an opt-in live acceptance flow for post-reindex verification.

## Impact

- Adds scripts and documentation under the retrieval evaluation/interview areas.
- Does not change the Agent runtime path, `lookup_knowledge`, VectorStore search logic, or Milvus schema.
- Live verification depends on a running Spring Boot service and a reindexed Milvus/Zilliz collection.