fix(ci): unblock deploy on main — test-go vet, loc-budget, build-sha

test-go (go vet runs as part of go test) failed on two pre-existing iace spots:
- cmd/iace-audit/main.go: 6x fmt.Println with redundant trailing \n
- internal/iace/document_export_sources.go: duplicate `r == ';'` clause

build-sha-integrity failed because the alpine job installs python3 but not
pyyaml, so `import yaml` raised ModuleNotFoundError. Add py3-yaml to apk.

loc-budget flagged iace_handler_init_helpers.go (530 lines, committed state).
The other session already split it to 455 in the working tree (uncommitted);
grandfather it until that split lands, then remove the exception.

Verified locally: go test ./... all ok, go vet clean, check-loc.sh exit 0.

[guardrail-change]

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

.claude/rules/loc-exceptions.txt

@@ -231,3 +231,13 @@ admin-compliance/app/sdk/ai-act/page.tsx
 # Endpoint-/Helfer-Gruppen geplant; bis dahin Exception mit Rationale.
 # [guardrail-change]
 backend-compliance/compliance/api/agent_doc_check_extras.py
+
+# --- 2026-06-10 CI-Unblocker: IACE handler init helpers ---
+# iace_handler_init_helpers.go (530 im CI-Stand): Init-/Wiring-Helfer der
+# IACE-Handler, ueber den 500-Cap gewachsen. Die andere Session hat die Datei
+# im Working-Tree bereits auf 455 Zeilen gesplittet (uncommittet) — sobald
+# dieser Split committet ist, MUSS diese Exception wieder entfernt werden.
+# Bis dahin Exception mit Rationale, damit der Deploy nicht an pre-existing
+# IACE-Refactor-Zwischenstand scheitert.
+# [guardrail-change]
+ai-compliance-sdk/internal/api/handlers/iace_handler_init_helpers.go