VALUE-03B1: freeze generation configuration end to end

[daniele21]

Parent: #144
Includes: VALUE-03A + VALUE-03B1

VALUE-03B1 — frozen generation configuration path

This is the first integrated software increment of VALUE-03. Per the current delivery policy, deterministic software slices may merge into dev before the final REAL_ENVIRONMENT phase.

User value

The configuration reviewed in Find best setup is now a real execution identity, not display-only metadata. The exact request-generation values are frozen into the plan, launch config, immutable Run fingerprint and inference requests.

Changes

• typed backend-owned generation parameter domains from Local LLM Server registry are preserved with provenance; invalid/unknown domains fail closed and do not enable sweeps;
• StarterRunConfig can carry an optional exact GenerationConfig while remaining backward-compatible with authored suite defaults;
• campaign planning exposes an explicit frozen configuration matrix with stable configuration_id + generation digest;
• the fixed strategy currently produces exactly one fixed-1 configuration per candidate;
• plan estimates derive run/request counts from candidate × configuration cardinality;
• campaign run specs and durable entries carry configuration identity;
• Campaign uniqueness is now (candidate_id, configuration_id), enabling future multiple configurations for one model candidate without enabling them yet;
• runner fingerprints the frozen generation config and the orchestrator sends fingerprint.generation to the inference adapter;
• plan digest contract advances to campaign-plan-v3 so the exact matrix is part of reviewed identity.

Tests

• declared domains are validated and preserved without implicitly enabling searches;
• fixed plan/configuration identity and digest are deterministic;
• launch preserves the exact reviewed generation config;
• same candidate may own distinct configuration identities, duplicate pairs are rejected;
• inference requests use the generation frozen in the fingerprint even when it differs from the suite-authored generation.

Deliberate boundary

Quick / Standard / Thorough / Custom remain blocked. This PR does not invent sampling cardinalities, union/intersection semantics, alias translation, or sweep points. Those require the next VALUE-03B slice once deterministic expansion is explicit.

Evidence boundary

Software semantics only. REAL_ENVIRONMENT VALUE-03D is deferred until the planned software modifications are consolidated on dev; no real model/device performance claim is made by this PR.