fix(boundaries): untrack go.work, add cross-engine import guard (#51)

- Added go.work/go.work.sum to .gitignore (engines use local go.work only)
- Untracked committed go.work from git index
- Expanded boundary guard to check for forbidden cross-engine imports
- Made boundary script executable
- Updated README Ecosystem Boundaries to clarify local-only types

Author: Patel230

.gitignore

@@ -25,5 +25,9 @@ dist/
 .DS_Store
 coverage.out
 
+# Go workspace (local dev only — each developer creates their own)
+go.work
+go.work.sum
+
 # Lefthook-generated wrappers (logic lives in lefthook.yml)
 .githooks/

README.md

@@ -40,9 +40,10 @@ When your app calls a model, eyrie figures out which provider to use, how to tal
 
 eyrie is a Hawk support engine. Keep the dependency edge one-way:
 
-- depend on `hawk-core-contracts` when a stable cross-repo contract is needed
+- eyrie uses local-only types (provider/transport types are eyrie-scoped, not shared contracts)
 - do not import `hawk/internal/*`
-- do not import removed legacy path `hawk/shared/types`; use `hawk-core-contracts/types`
+- do not import removed legacy path `hawk/shared/types`
+- do not import other engines (`yaad`, `tok`, `trace`, `sight`, `inspect`) — engines are peers, not dependencies
 
 ## Quick Start
 

go.work

@@ -4,18 +4,37 @@ set -euo pipefail
 ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
 cd "$ROOT_DIR"
 
+FORBIDDEN_HAWK='github\.com/GrayCodeAI/hawk/(internal/|shared/types)'
+FORBIDDEN_ENGINES='github\.com/GrayCodeAI/(yaad|tok|trace|sight|inspect)(/|")'
+
+exit_code=0
+
 if command -v rg >/dev/null 2>&1; then
-  violations="$(rg -n 'github\.com/GrayCodeAI/hawk/(internal/|shared/types)' --glob '*.go' . || true)"
+  violations="$(rg -n "$FORBIDDEN_HAWK" --glob '*.go' . || true)"
+  engine_violations="$(rg -n "$FORBIDDEN_ENGINES" --glob '*.go' . || true)"
 else
-  violations="$(grep -rn --include='*.go' -E 'github\.com/GrayCodeAI/hawk/(internal/|shared/types)' . || true)"
+  violations="$(grep -rn --include='*.go' -E "$FORBIDDEN_HAWK" . || true)"
+  engine_violations="$(grep -rn --include='*.go' -E "$FORBIDDEN_ENGINES" . || true)"
 fi
 
 if [[ -n "${violations}" ]]; then
   echo "forbidden Hawk imports found:"
   echo "${violations}"
   echo
   echo "support repos must use hawk-core-contracts or local contracts, not hawk/internal or removed hawk/shared/types"
-  exit 1
+  exit_code=1
+fi
+
+if [[ -n "${engine_violations}" ]]; then
+  echo "forbidden cross-engine imports found:"
+  echo "${engine_violations}"
+  echo
+  echo "support engines must not import other engines directly — they are peers, not dependencies"
+  exit_code=1
+fi
+
+if [[ $exit_code -ne 0 ]]; then
+  exit $exit_code
 fi
 
 echo "ecosystem boundary guard passed"