Normalize 'under' path handling and add remote embedding support

[m1rl0k]

Refactors all uses of the 'under' parameter to normalize as a suffix and use MatchText for substring matching, improving path filtering consistency. Adds support for remote embedding services in memory.py and mcp_memory_server.py, routing embedding calls to remote or local as appropriate. Updates documentation and skill usage tips to reflect new search strategies, parallel execution, and token efficiency defaults.

[augmentcode]

🤖 Augment PR Summary

Summary: This PR standardizes how the under filter is handled across search/rerank/expand flows and adds support for routing embeddings to a remote embedding service for MCP memory operations.

Changes:

• Normalizes under as a path “suffix” (e.g. scripts → /scripts) for more consistent path filtering.
• Updates Qdrant filters on metadata.path_prefix to use MatchText (substring/token-style matching) instead of exact MatchValue.
• Applies the normalized under behavior in hybrid search, embedding expansion, and local rerank tooling.
• Adds remote-embedding routing in scripts/mcp_impl/memory.py and scripts/mcp_memory_server.py by detecting RemoteEmbeddingStub and delegating to embed_batch().
• Keeps local embedding behavior unchanged when not in remote mode.
• Extends user-facing docs and skill guidance with a two-phase search strategy, parallel tool-call patterns, and TOON/token-efficiency defaults.

Technical Notes: Remote embedding is performed via the existing scripts.ingest.qdrant.embed_batch routing logic; local embedding continues to use model.embed().

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[augmentcode]

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[augmentcode]

metadata.path_prefix filtering is now using MatchText, but the indexer currently creates a KEYWORD payload index for metadata.path_prefix (see ensure_payload_indexes in scripts/ingest/qdrant.py), which may cause Qdrant to reject the filter or change matching semantics. Consider aligning the payload schema/index type (and any migration path) so under filtering stays reliable.

Other Locations

• scripts/hybrid_search.py:1111
• scripts/hybrid/expand.py:811
• scripts/rerank_tools/local.py:372
• scripts/rerank_tools/local.py:453

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