chore: Mark US-003 as complete, update progress log

Author: LoCoBench Bot

ralph-gapfill-docgen/prd.json

@@ -42,8 +42,8 @@
         "Task registered"
       ],
       "priority": 3,
-      "passes": false,
-      "notes": "Terraform: internal/terraform/context.go, graph_builder_plan.go, node_resource_apply.go, internal/providers/provider.go."
+      "passes": true,
+      "notes": "Terraform at a3dc571150 (main 2026-02-16). 13 required_topics covering GraphTransformer, ConfigTransformer, StateTransformer, ReferenceTransformer, ProviderTransformer, provider plugin, state manager, SyncState, GraphNodeExecutable, ContextGraphWalker, dynamic expansion. 5 file_references (internal/terraform/context.go, graph_builder, node_resource, providers, states). 3 data_flow (plan execution, apply execution, state read-modify-persist). 4 extension_points. Registered in selected_benchmark_tasks.json and docgen_2config.sh."
     },
     {
       "id": "US-004",

ralph-gapfill-docgen/progress.txt

@@ -55,3 +55,25 @@
   - MCP advantage higher for Istio (0.860) than Envoy (0.855) due to more cross-file dependencies (0.92 vs 0.90)
   - test.sh is reusable across all docgen architecture tasks — just copy from docgen-arch-001
 ---
+
+## 2026-02-16 - US-003
+- Created docgen-arch-003: Terraform Plan/Apply Pipeline architecture doc task
+- Files created:
+  - benchmarks/ccb_docgen/docgen-arch-003/task.toml (category=architecture_doc, language=go, difficulty=hard, time_limit_sec=1200)
+  - benchmarks/ccb_docgen/docgen-arch-003/instruction.md (covers Graph Builder, Provider Interface, State Management, Execution Flow)
+  - benchmarks/ccb_docgen/docgen-arch-003/tests/ground_truth.json (13 required_topics, 5 file_references, 3 data_flow, 4 extension_points)
+  - benchmarks/ccb_docgen/docgen-arch-003/tests/test.sh (updated to handle new scoring_categories JSON structure)
+  - benchmarks/ccb_docgen/docgen-arch-003/environment/Dockerfile (blobless clone of hashicorp/terraform at commit a3dc5711)
+- Files modified:
+  - configs/docgen_2config.sh (added docgen-arch-003 to ALL_TASK_IDS and TASK_SG_REPO_NAMES)
+  - configs/selected_benchmark_tasks.json (registered task with mcp_benefit_score=0.865)
+- **Learnings for future iterations:**
+  - Terraform architecture has 4 key layers: Graph Builder (transforms-based DAG construction), Provider Interface (plugin coordination), State Management (concurrent-safe access), Execution (walker pattern with dynamic expansion)
+  - Used WebSearch + WebFetch to research Terraform's internal architecture from docs/architecture.md
+  - Found specific commit (a3dc571150) from GitHub's main branch via WebFetch
+  - Ground truth covers internal/terraform/ (context.go, graph_builder/, node_resource/), internal/providers/, internal/states/
+  - Updated test.sh verifier to handle new ground_truth.json structure with nested "scoring_categories" (topics[], files[], flows[], points[])
+  - MCP benefit score (0.865) is highest so far due to high cross_file_deps (0.93) and semantic_search_potential (0.88)
+  - The ground_truth.json structure evolved: now uses "scoring_categories" with nested objects instead of flat arrays
+  - Key Terraform components: GraphTransformer interface, ConfigTransformer, StateTransformer, ReferenceTransformer, ProviderTransformer, EvalContext, statemgr, SyncState, GraphNodeExecutable, ContextGraphWalker, GraphNodeDynamicExpandable
+---