feat(WP-0016): build infrastructure — ghcid standalone script and error-fix loop workplan

- scripts/compile-check: runs ghcid in isolation (no postgres/tailwind) for fast
  incremental compilation feedback; writes errors to /tmp/ihub-compile-errors.txt
- .ghci: add -fkeep-going so GHC reports all module errors in one pass
- WP-0016 workplan: documents module dependency layers, error-fix SOP,
  and autonomous ralph-loop approach for iterative error fixing

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

.ghci

@@ -4,4 +4,7 @@
 -- Resource limit: override IHP's default -j (unlimited parallel) with -j1
 -- on this constrained host (2 CPU / 3.8 GiB RAM).
 :set -j1
+-- Report errors from all modules in one pass (don't stop at first failure).
+-- Critical for batch error fixing — see IHUB-WP-0016 C4.
+:set -fkeep-going
 import IHP.Prelude