(chore) add associate tasks

tasks/1.12-go-hygiene.md

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+# 1.12 — Go error-handling / context hygiene (REFACTOR)
+
+Phase: 1 — Atlas Core
+Stage: REFACTOR
+
+Depends on: [1.11](1.11-simplify-pass.md)
+
+- [ ] Confirm no `_ =` on errors, no naked returns, every upstream call carries a `context.Context` (go-error-handling, go-context skills)
+
+## Verify
+
+```bash
+go test ./... -run TestRedact -v
+go test ./... -run TestRBAC -v
+go test ./... -run TestSnapshot -v
+```