feat: add MemoryScoring bus family (#5560)

[YellowSnnowmann]

Summary

• Adds the 21st memory bus capability family: MemoryScoring with three methods — extract_entities, embed_text, embedder_slug
• Routes entity extraction and text embedding through the bus contract, eliminating direct tinymemory-core calls on the host side
• Capability::Scoring registered at index 20; ALL array grows from 20 to 21 entries

Problem

Three operations in the host (extract_query_entities, embedder build+embed, effective_embedder_slug) called into tinymemory-core directly, bypassing the memory bus. This prevents the host from loading the engine as a module and routing those calls over the bus.

Solution

• tinymemory-api: new MemoryScoring trait (scoring.rs) + NullMemoryProvider null impl + MemoryDriver::as_scoring() accessor
• tinymemory-bus: Capability::Scoring variant, index 20, ALL length → 21, as_str() = "scoring"
• tinymemory-module: three handlers in #[tinybus::interface] — ExtractEntities, EmbedText, EmbedderSlug — routed through require_family!(as_scoring)
• tinymemory-tinycortex: full impl MemoryScoring for TinycortexProvider backed by the existing tree::nlp and tree::score::embed::factory code paths

Submission Checklist

• Tests added or updated — capabilities_tests.rs updated (20 → 21, "scoring" in names vec)
• No new external network dependencies
• Null impl returns Unsupported for all three methods

Impact

Additive only — no existing callers changed. The host wires onto this in the companion openhuman PR (#5560).

Related

• Closes: openhuman #5560 (host-side wiring in companion PR)

[coderabbitai]

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[tinysweeper]

tinysweeper found nothing blocking. Approving.

$0.0000 · 0 in / 0 out

[tinysweeper]

How this change flows

2 changed behaviours across 9 relationships. 6 surrounding behaviours are shown (60 graph nodes walked). 30 further behaviours left out to keep the diagram readable.

flowchart LR
  n0["NullMemoryProvider<br/>changed"]:::changed
  n1["Capability<br/>changed"]:::changed
  n2["iter"]:::impacted
  n3["...embers_are_exactly_the_published_contract"]:::impacted
  n4["EngineRuntimeConfig"]:::impacted
  n5["...served_method_is_declared_in_the_manifest"]:::impacted
  n6["Result"]:::impacted
  n7["blocking"]:::impacted
  n2 -->|uses| n1
  n3 -->|uses| n0
  n3 -->|calls| n2
  n3 -->|tests| n2
  n5 -->|uses| n0
  n5 -->|calls| n2
  n5 -->|tests| n2
  n7 -->|uses| n4
  n7 -->|uses| n6
  classDef changed fill:#0d4429,stroke:#238636,color:#e6edf3
  classDef impacted fill:#161b22,stroke:#6e7681,color:#c9d1d9
  classDef flagged fill:#5a1e02,stroke:#d93f0b,color:#ffffff
  classDef blocking fill:#67060c,stroke:#f85149,color:#ffffff

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_{Green: changed behaviour. Grey: surrounding behaviour. Arrows name the call, use, implementation, or test relationship. Orange: has findings. Red: has a finding that blocks the merge.}