VALUE-03A: consume declared generation domains

[daniele21]

Parent: #144
Producer contract: daniele21/korgis#205

Outcome

Consume backend/model-owned request-generation parameter domains from Local LLM Server without inventing ranges or enabling configuration sweeps yet.

Boundary

• /api/v1/models/registry enrichment remains first-party and best-effort.
• GenerationParameterDomainReadModel validates the public producer shape and adds explicit scope=request_generation / source=local_llm_server while preserving provenance=registry_declared.
• Domains stay model-scoped on DiscoveredModelReadModel and CandidateModelReadModel.
• Runtime-load parameters remain separate and observational.
• Malformed domain metadata is ignored with a warning; successful generic model discovery is preserved.

Deliberate VALUE-03A limit

This PR does not choose union/intersection semantics across models and does not expand a domain into configurations. bounded_generation_parameter_ranges remains empty and Quick/Standard/Thorough/Custom remain unavailable. Fixed remains the only executable strategy. Alias translation such as Korgis max_tokens -> Performance Lab max_output_tokens is deferred to VALUE-03B where it can be frozen into GenerationConfig, plan digest and Run fingerprints.

Tests

Focused contract tests cover:

• valid Korgis numeric + boolean domains;
• separation from runtime-load configuration;
• malformed domain fail-closed behavior;
• propagation into candidate planning while sweep strategies remain blocked.

Evidence boundary

Deterministic software semantics only. This makes no real-model/device/performance claim.

Integration gate

DO NOT MERGE while VALUE-02D #132 is not REAL_ENVIRONMENT PASS / VALUE-02 acceptance is not formally closed. Current dev already contains the VALUE-02 software integration, but #120 and #132 remain open; this PR does not reinterpret that as real acceptance.

[daniele21]

VALUE-03A software-ready — exact-head deterministic validation PASS

Exact branch head: caed430641d40228e9778155f5b8157daf5238a5
Base: dev@0b9c376f2dbcbb167f8df8488374c1b0c5d0ace2

Repository-owned evidence on this exact head:

• Repository Health run 33766112408: PASS
• Repository Validation run 33766112384: PASS
• Python 3.12: PASS
• Python 3.13: PASS
• Frontend check/test/build: PASS
• Browser/Product/Built Product: selector N/A / skipped for this isolated contract slice

Producer daniele21/local-llm-server#205 is now merged to Local LLM Server dev (e7e186c96b66f4ddb3a01e926b5a43b69aceeca6).

The slice remains deliberately limited to declared-domain ingestion and model-scoped propagation. No configuration expansion/search strategy is enabled; bounded_generation_parameter_ranges remains empty and Fixed remains the only executable strategy.

Integration remains blocked: keep this PR draft / DO NOT MERGE until VALUE-02D #132 is REAL_ENVIRONMENT PASS and VALUE-02 acceptance is formally closed. This evidence is software semantics only and makes no real model/device/performance claim.