[rajivpant]

#159 made rag.init_collection's vector_size argument required, so a collection is never initialised at a dimension the embedding model does not produce. _ensure_demo_indexed in src/ragbot.py still called init_collection(DEMO_WORKSPACE_NAME) without it, so the first RAGBOT_DEMO=1 run would raise TypeError before indexing anything. No test covered the hook.

The call is removed: index_content and index_skills each initialise the workspace at the model's dimension themselves.

tests/test_demo_mode.py now covers the hook. One test checks that it indexes the bundled content and demo skills into their workspaces when the index is empty; the other checks that it skips them when the index is populated. On main the first test fails with the TypeError; with this change both pass. make test-fast: all green.

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