feat(coder): add model resolution core + multi-batch matcher

Model resolution (from oh-my-openagent/model-core): 6-step priority
resolution pipeline (UI select -> user config -> category default ->
user fallback -> policy chain -> system default), provider fallback
chains, fuzzy model matching, error classification, provider-specific
model ID transforms. 14 files, zero runtime deps.

Multi-batch matcher (from boocontext-audit): 6 batch types
(Observational, Actionable, PreviouslyApplied, Disambiguation,
ResponseAnalysis, LowCriticality) for behavioral guideline evaluation.
RelationalResolver with iterative convergence (DEPENDS_ON,
PRIORITIZES, ENTAILS, TAG_ALL, TAG_PRIORITIZES). SchematicGenerator
abstract class with retry and execution plans. 4 files.

apps/coder/src/services/model-resolution/index.ts

@@ -0,0 +1,80 @@
+export type {
+  FallbackEntry,
+  ModelRequirement,
+} from "./model-requirement-types.js"
+export type {
+  FallbackModelObject,
+} from "./fallback-model-object.js"
+export type {
+  DelegatedModelConfig,
+  ModelResolutionRequest,
+  ModelResolutionProvenance,
+  ModelResolutionResult,
+} from "./model-resolution-types.js"
+export type {
+  ModelResolutionInput,
+  ModelSource,
+  ExtendedModelResolutionInput,
+} from "./model-resolver.js"
+export {
+  resolveModel,
+  resolveModelWithFallback,
+  normalizeFallbackModels,
+  flattenToFallbackModelStrings,
+} from "./model-resolver.js"
+export {
+  normalizeModel,
+  normalizeModelID,
+} from "./model-normalization.js"
+export {
+  fuzzyMatchModel,
+  isModelAvailable,
+} from "./model-availability.js"
+export {
+  transformModelForProvider,
+  transformModelForProviderDisplay,
+} from "./provider-model-id-transform.js"
+export {
+  buildFallbackChainFromModels,
+  parseFallbackModelEntry,
+  parseFallbackModelObjectEntry,
+  findMostSpecificFallbackEntry,
+} from "./fallback-chain-from-models.js"
+export {
+  KNOWN_VARIANTS,
+} from "./known-variants.js"
+export {
+  _setModelResolutionLogImplementationForTesting,
+  resolveModelPipeline,
+} from "./model-resolution-pipeline.js"
+export type {
+  ModelResolutionRequest as PipelineModelResolutionRequest,
+  ModelResolutionProvenance as PipelineModelResolutionProvenance,
+  ModelResolutionResult as PipelineModelResolutionResult,
+  ModelResolutionDeps,
+} from "./model-resolution-pipeline.js"
+export {
+  isRetryableModelError,
+  shouldRetryError,
+  getNextFallback,
+  hasMoreFallbacks,
+  selectFallbackProvider,
+  selectFallbackProviderWithCache,
+} from "./model-error-classifier.js"
+export type {
+  ErrorInfo,
+} from "./model-error-classifier.js"
+export type {
+  ProviderCache,
+  ModelMetadata,
+} from "./provider-cache.js"
+export type {
+  ProviderModelsCache,
+  ConnectedProvidersAdapter,
+} from "./connected-providers-cache.js"
+export {
+  readConnectedProvidersCache,
+  findProviderModelMetadata,
+  readProviderModelsCache,
+  connectedProvidersAdapter,
+} from "./connected-providers-cache.js"