Add generic deterministic CaseBuilder with versioned input contracts

README.md

@@ -6,6 +6,8 @@ The implemented v1 contract is documented in
 [docs/package-format-v1.md](docs/package-format-v1.md).
 Job state, checkpoints and inbox admission are documented in
 [docs/lifecycle-v1.md](docs/lifecycle-v1.md).
+Generic case construction and its input contracts are documented in
+[docs/case-builder-v1.md](docs/case-builder-v1.md).
 
 Requires Python 3.11 or newer.
 
@@ -16,5 +18,5 @@ python -m venv .venv
 ```
 
 The lifecycle foundation supports one-pass inbox processing and resumable package
-checkpoints. It includes no analysis worker, CaseBuilder, LLM,
+checkpoints and a deterministic generic CaseBuilder. It includes no analysis worker or LLM,
 case interpretation, hypothesis generation or investigation tools.