fix(patches): validator portability, clearer docs, broader hook trigger

.superpowers/handoff/task-B1-report.md

@@ -0,0 +1,40 @@
+# Task B1 Report: Create the patch registry with the RcppParallel entry
+
+## Status: Completed
+
+All steps completed successfully.
+
+## Files Created
+
+1. **`local/patches/registry.json`**
+   - Contains the curated patch registry array with one entry for RcppParallel
+   - Entry specifies platform-specific build-time override: `RCPP_PARALLEL_USE_TBB=0` environment variable for alpine and ubuntu-2604
+   - No source diff needed; the fix is purely an environment variable override
+
+2. **`local/patches/README.md`**
+   - Documents the JSON schema with field semantics copied from the design spec
+   - Provides instructions on how to add new patch entries
+   - Explains that source diffs go in `local/patches/<pkg>/<file>.patch` and are referenced by the `patch` field
+   - Includes validation instructions using R
+
+## Verification
+
+Ran the verification R script:
+
+```r
+Rscript -e 'x <- jsonlite::fromJSON("local/patches/registry.json", simplifyVector = FALSE); stopifnot(length(x) == 1L, x[[1]]$package == "RcppParallel"); cat("ok\n")'
+```
+
+Output: `ok`
+
+The JSON parses correctly, contains exactly one entry, and the package name is "RcppParallel" as expected.
+
+## Commit
+
+```
+5bf9b2e feat(patches): add patch registry with RcppParallel TBB workaround
+```
+
+Branch: `t3code/patch-packages-before-build`
+
+Both files were staged and committed with the message specified in the task brief.