Fix GT coverage pipeline: 42% → 99.1% benchmark event coverage

- Move benchmarks/ccb_contextbench/ → calibration/curator_calibration/
  to stop calibration tasks from polluting benchmark GT scans
- Fix audit_gt_coverage.py: don't short-circuit on invalid-schema
  ground_truth.json when valid oracle_answer.json exists; recognize
  expected_files format from scaling-gap tasks
- Fix update_gt_registry.py: handle expected_files format; replace
  stale entries instead of accumulating them (248 → 402 entries)
- Fix normalize_retrieval_events.py: strip bl_/sgonly_/artifact_
  prefixes and Harbor suffixes in _normalize_task_name(); add
  case-insensitive GT registry fallback for uppercase CCX- task names
- Update script references for contextbench path change
- Clean up 958 stale prefixed event files from retrieval_events/

Benchmark task GT: 100% (404/404 tasks)
Benchmark event GT: 99.1% (4516/4559 events)
Registry: 402 entries covering all benchmark tasks

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sjarmak

…_bugfix__634fe9b8/environment/Dockerfile …_bugfix__634fe9b8/environment/Dockerfilebenchmarks/ccb_contextbench/cb-multi-swe-bench__c__maintenance__bugfix__634fe9b8/environment/Dockerfile renamed to calibration/curator_calibration/cb-multi-swe-bench__c__maintenance__bugfix__634fe9b8/environment/Dockerfile benchmarks/ccb_contextbench/cb-multi-swe-bench__c__maintenance__bugfix__634fe9b8/environment/Dockerfile renamed to calibration/curator_calibration/cb-multi-swe-bench__c__maintenance__bugfix__634fe9b8/environment/Dockerfile

@@ -4,9 +4,9 @@
 
 FROM ubuntu:22.04
 
-ENV SOURCEGRAPH_REPO_NAME=sg-evals/ponyc--3ed6c09a
-
 ENV DEBIAN_FRONTEND=noninteractive
+ENV SOURCEGRAPH_REPOS="sg-evals/ponyc--3ed6c09a"
+
 RUN apt-get update && apt-get install -y --no-install-recommends \
     git \
     ca-certificates \

…_634fe9b8/environment/Dockerfile.sg_only …_634fe9b8/environment/Dockerfile.sg_onlybenchmarks/ccb_contextbench/cb-multi-swe-bench__c__maintenance__bugfix__634fe9b8/environment/Dockerfile.sg_only renamed to calibration/curator_calibration/cb-multi-swe-bench__c__maintenance__bugfix__634fe9b8/environment/Dockerfile.sg_only benchmarks/ccb_contextbench/cb-multi-swe-bench__c__maintenance__bugfix__634fe9b8/environment/Dockerfile.sg_only renamed to calibration/curator_calibration/cb-multi-swe-bench__c__maintenance__bugfix__634fe9b8/environment/Dockerfile.sg_only

@@ -0,0 +1,99 @@
+# IMPORTANT: Source Code Access
+
+**Local source files are not present.** Your workspace does not contain source code. You **MUST** use Sourcegraph MCP tools to discover, read, and understand code before making any changes.
+
+**Target Repositories (version-pinned mirrors):**
+
+- `github.com/sg-evals/ponyc--3ed6c09a` — use `repo:^github.com/sg-evals/ponyc--3ed6c09a$` filter
+
+Scope ALL keyword_search/nls_search queries to these repos.
+Use the repo name as the `repo` parameter for read_file/go_to_definition/find_references.
+
+
+## Required Workflow
+
+1. **Search first** — Use MCP tools to find relevant files and understand existing patterns
+2. **Read remotely** — Use `sg_read_file` to read full file contents from Sourcegraph
+3. **Edit locally** — Use Edit, Write, and Bash to create or modify files in your working directory
+4. **Verify locally** — Run tests with Bash to check your changes
+
+## Tool Selection
+
+| Goal | Tool |
+|------|------|
+| Exact symbol/string | `sg_keyword_search` |
+| Concepts/semantic search | `sg_nls_search` |
+| Trace usage/callers | `sg_find_references` |
+| See implementation | `sg_go_to_definition` |
+| Read full file | `sg_read_file` |
+| Browse structure | `sg_list_files` |
+| Find repos | `sg_list_repos` |
+| Search commits | `sg_commit_search` |
+| Track changes | `sg_diff_search` |
+| Compare versions | `sg_compare_revisions` |
+
+**Decision logic:**
+1. Know the exact symbol? → `sg_keyword_search`
+2. Know the concept, not the name? → `sg_nls_search`
+3. Need definition of a symbol? → `sg_go_to_definition`
+4. Need all callers/references? → `sg_find_references`
+5. Need full file content? → `sg_read_file`
+
+## Scoping (Always Do This)
+
+```
+repo:^github.com/ORG/REPO$           # Exact repo (preferred)
+repo:github.com/ORG/                 # All repos in org
+file:.*\.ts$                         # TypeScript only
+file:src/api/                        # Specific directory
+```
+
+Start narrow. Expand only if results are empty.
+
+## Efficiency Rules
+
+- Chain searches logically: search → read → references → definition
+- Don't re-search for the same pattern; use results from prior calls
+- Prefer `sg_keyword_search` over `sg_nls_search` when you have exact terms
+- Read 2-3 related files before synthesising, rather than one at a time
+- Don't read 20+ remote files without writing code — once you understand the pattern, start implementing
+
+## If Stuck
+
+If MCP search returns no results:
+1. Broaden the search query (synonyms, partial identifiers)
+2. Try `sg_nls_search` for semantic matching
+3. Use `sg_list_files` to browse the directory structure
+4. Use `sg_list_repos` to verify the repository name
+
+---
+
+# Fix: Multi-SWE-Bench__c__maintenance__bugfix__634fe9b8
+
+**Repository:** github.com/sg-evals/ponyc--3ed6c09a (mirror of ponylang/ponyc)
+**Language:** c
+**Category:** contextbench_cross_validation
+
+## Description
+
+Fix extracting docstring from constructors
+
+from classes or actors with initialized fields
+
+by executing `sugar_docstring` on the constructors before adding the initializers. This will actually execute `sugar_docstring` twice on such constructors, but as it is idempotent, there is no danger here.
+
+The docstrings have been inlined into the constructor body before.
+
+Now they will show up correctly in the generated docs.
+
+Fixes #2582
+
+## Task
+
+Diagnose and fix the issue described above. The repository has been cloned at the relevant commit. Make the necessary code changes to resolve the bug.
+
+## Success Criteria
+
+Your code changes should resolve the described issue. The implementation will be verified against the expected patch using diff similarity scoring.
+
+**Time Limit:** 30 minutes