Initial SQL-only 1C adapter baseline

plugins/1c/rag/manifests/corpus.yaml

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+id: 1c-rag-corpus
+name: 1C RAG Corpus
+status: draft
+source_dir: plugins/1c/rag/sources
+official_docs:
+  source_manifest: plugins/1c/rag/official-docs/sources.yaml
+  raw_dir: plugins/1c/rag/official-docs/raw
+  normalized_dir: plugins/1c/rag/official-docs/normalized
+  access: licensed_private
+  usage: rag_only_by_default
+prepared_path: plugins/1c/datasets/prepared/rag_corpus.jsonl
+supported_extensions:
+  - .md
+  - .txt
+  - .bsl
+  - .os
+chunking:
+  chunk_size: 1800
+  overlap: 200
+privacy:
+  allow_private_client_data: false
+  require_secret_scrub: true
+  notes: "Do not place database dumps, credentials, tokens, personal data, or client-specific secrets in this corpus. Official 1C:ITS documents are licensed private sources: keep full text out of git and prefer RAG over fine-tuning."