Anthropic recovery PR gate churn

ROADMAP.md

@@ -342,7 +342,7 @@ Automated + human review threads on [PR #825](https://github.com/gunb-ai/gunbc/p
 
 [PR #901](https://github.com/gunb-ai/gunbc/pull/901) landed typed LLM/GitHub inputs and **named** downstream work as searchable **`closure:<identifier>`** strings in `dsl/extdeps/llm/*.dag`. The three triggers the program still tracks as **explicit closure work** (search these tokens in-repo and in issue bodies):
 
-1. **`rest_typed_response_body` — PARTIAL 2026-05-04 (Row 32 residual slice)** — Typed service inputs; REST `response { 200 => Typed… }` is implemented for the OpenAI ChatCompletion and Anthropic Messages 200-body carriers, and the stale typed-projection receipts `structural_coverage_gap_openai_chat_completion_outputs` / `structural_coverage_gap_anthropic_messages_outputs` are retired with regression witnesses. The Row 32 residual slice typed OpenAI ChatCompletion 200 fidelity fields (`service_tier`, `system_fingerprint`, `logprobs`, `refusal` on the text-bearing message slice, `annotations`, `completion_tokens_details`, `prompt_tokens_details`), typed Anthropic Messages 200 fidelity fields (`container`, citation coproduct, cache-token counters, `service_tier`), and migrated OpenAI Responses from `response { 200 => Json }` to a narrow `OpenAiResponses200Body` proof-of-shape. Remaining response-fidelity residuals stay tracked in `structural_coverage_gap_openai_chat_completion_200_residual`, `structural_coverage_gap_anthropic_messages_200_residual`, and `structural_coverage_gap_openai_responses_200_residual`: OpenAI ChatCompletion tool/function/audio/multimodal response variants and refusal-without-content need a response content/tool/audio coproduct, OpenAI Responses `output_text.logprobs` plus refusal/tool/reasoning/error/multimodal output variants need an output item/content coproduct beyond the current required-text projection carrier, Anthropic thinking/tool/web-search/server-tool content blocks need a content-block coproduct, and Anthropic `container` remains presence-preserved as `Json?` until the container-management response surface has a structural consumer. Broader non-LLM `response { 200 => Json }` operations are separate scope.
+1. **`rest_typed_response_body` — PARTIAL 2026-05-04 (Row 32 residual slice)** — Typed service inputs; REST `response { 200 => Typed… }` is implemented for the OpenAI ChatCompletion and Anthropic Messages 200-body carriers, and the stale typed-projection receipts `structural_coverage_gap_openai_chat_completion_outputs` / `structural_coverage_gap_anthropic_messages_outputs` are retired with regression witnesses. The Row 32 residual slice typed OpenAI ChatCompletion 200 fidelity fields (`service_tier`, `system_fingerprint`, `logprobs`, `refusal` on the text-bearing message slice, `annotations`, `completion_tokens_details`, `prompt_tokens_details`), typed Anthropic Messages 200 fidelity fields (citation coproduct, content-block coproduct, cache-token counters, typed `service_tier`), and migrated OpenAI Responses from `response { 200 => Json }` to a narrow `OpenAiResponses200Body` proof-of-shape. Remaining response-fidelity residuals stay tracked in `structural_coverage_gap_openai_chat_completion_200_residual`, `structural_coverage_gap_anthropic_messages_200_residual`, and `structural_coverage_gap_openai_responses_200_residual`: OpenAI ChatCompletion tool/function/audio/multimodal response variants and refusal-without-content need a response content/tool/audio coproduct, OpenAI Responses `output_text.logprobs` plus refusal/tool/reasoning/error/multimodal output variants need an output item/content coproduct beyond the current required-text projection carrier, and Anthropic `container` remains presence-preserved as `Json?` until the container-management response surface has a structural consumer while beta/server-tool result payloads and the `content/0/text` variant-aware typed response projection remain explicitly tracked. The Anthropic Messages 200 content-block response wire contract remains a separate `rest_request_wire_serde_alignment` residual until a generated response enum serde/emitter ratchet consumes it. Broader non-LLM `response { 200 => Json }` operations are separate scope.
 
 2. **`openai_chat_message_full_coproduct`** — Retired by issue #2605 / PR #2627. `OpenAiChatMessage` is now a role-tagged request coproduct with tool + `tool_call_id`, legacy function rows, and typed text/image content parts. Residual additive content/tool surfaces are tracked by `structural_coverage_gap_openai_chat_message_additive_content_parts` in `dsl/extdeps/llm/openai.dag`.
 

dsl/extdeps/llm/anthropic.dag

@@ -274,12 +274,18 @@ type AnthropicMessages200ContentBlock
 // by `server_tool_input_payloads_unmodeled`.
 type AnthropicServerToolName = WebSearch | WebFetch | CodeExecution | BashCodeExecution | TextEditorCodeExecution | ToolSearchToolRegex | ToolSearchToolBm25 | Advisor
 
+// 🟢 TERMINAL provider-domain enum for Anthropic Messages 200 `usage.service_tier`.
+// Dissolution receipt: the field is a closed API string domain, not free-form
+// metadata; fact placement would duplicate the usage field authority, algebraic
+// form has no operator surface, and dimensional split has no independent axes.
+type AnthropicMessages200ServiceTier = Standard | Priority | Batch
+
 type AnthropicMessages200Usage {
   input_tokens: Int
   output_tokens: Int
   cache_creation_input_tokens: Int?
   cache_read_input_tokens: Int?
-  service_tier: String?
+  service_tier: AnthropicMessages200ServiceTier?
 }
 
 // Anthropic Messages 200 response role. The API currently returns only
@@ -334,6 +340,10 @@ data rest_request_wire_serde_alignment_receipt: List<String> = [
   "closure:rest_request_wire_serde_alignment|llm.Anthropic.Messages|AnthropicToolResultBlock|paid:type_internally_tagged_object_tool_result_nested_blocks"
 ]
 
+data structural_coverage_gap_anthropic_messages_200_content_block_wire_shape: List<String> = [
+  "closure:rest_request_wire_serde_alignment|llm.Anthropic.Messages|AnthropicMessages200ContentBlock|residue:messages_200_content_block_internally_tagged_object_unproved|trigger:generated response enum serde/emitter ratchet consumes the type-tagged AnthropicMessages200ContentBlock wire contract"
+]
+
 // -- Service: REST transport wiring ------------------------------
 
 service llm.Anthropic {