feat(inference): inference-llm PR-5 — Runtime registration

[joelteply]

Summary

PR-5 of inference-llm. Wires InferenceLlmModule into the Runtime so it's callable from the cognition path via inference/llm/request commands.

Pure Rust, zero TS, 20-line diff.

What lands

• Add "inference-llm" to EXPECTED_MODULES in runtime/runtime.rs
• runtime.register(Arc::new(InferenceLlmModule::new())) in ipc/mod.rs alongside the existing InferenceModule registration

Design choices

• Constructed via .new() (bus-less, stub-backed) rather than .with_bus_and_adapter(). Reason: with_bus_and_adapter requires an AIProviderAdapter Arc, which would couple PR-5's runtime registration to a specific LlamaCppAdapter init lifecycle. The substrate's LlamaCppAdapter is owned by AIProviderModule's adapter registry with its own initialization phase; threading the adapter Arc here would either duplicate the registration or create an init-ordering dependency this slice shouldn't introduce.
• The stub-backed registration is still useful: it exposes the inference/llm/request command surface to the cognition path so downstream PRs (turn-execute chaining drain-turn-frame → response_prompt → inference/llm/request) can wire against the real command name. Bus + adapter integration is a follow-up PR that updates the construction call here.

Test plan

• cargo build --features metal,accelerate --lib clean
• EXPECTED_MODULES enforcement validates at boot — if the registration is missing the runtime fails with "missing inference-llm" error
• Pre-push gate clean
• No new test fixtures needed — the module's existing 44/44 tests cover the trait-impl correctness; this PR just plumbs construction into runtime startup

Stack

• feat(inference): inference-llm PR-1 — typed event surface (MODULE-CATALOG §II) #1387 — inference-llm PR-1: typed event surface
• feat(inference): inference-llm PR-2 — InferenceLlmModule ServiceModule impl (stub-backed) #1391 — inference-llm PR-2: ServiceModule impl (stub-backed)
• feat(inference): inference-llm PR-3a — canonical ArtifactKeys + publishing helpers #1392 — inference-llm PR-3a: bus keys + publishing helpers
• feat(inference): inference-llm PR-3b — InferenceLlmModule auto-publishes via bus hook (pure Rust) #1393 — inference-llm PR-3b: auto-publish wiring
• feat(inference): inference-llm PR-4 — adapter integration (translation + new constructors) #1395 — inference-llm PR-4: adapter integration (translation + new constructors)
• This PR — inference-llm PR-5: Runtime registration
• FOLLOW-UP — adapter Arc wiring when LlamaCppAdapter init phase is integrated with Runtime startup

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