docs(AGENTS): add utils-lisp mandate for Lisp structural operations

- NEW: REPL-first workflow requirement
- NEW: Must use utils-lisp functions for any .lisp work
- NEW: Never use edit tool on .lisp files directly
- NEW: Post-task verification: REPL verified + utils-lisp used

.opencode/AGENTS.md

@@ -105,7 +105,15 @@ This agent MUST verify these conditions before, during, and after each task. Vio
 
 ### During Task (Literate Programming)
 
-- [ ] **Org-only edits** — Edit only `.org` files, never generated `.lisp` directly
+- [ ] **REPL-first workflow** — Explore in REPL before writing code
+- [ ] **Utils-lisp for structural ops** — Use these functions for any .lisp work:
+  - `utils-lisp-structural-extract` — Extract function definitions
+  - `utils-lisp-structural-inject` — Inject forms into definitions
+  - `utils-lisp-structural-wrap` — Wrap code in let/progn
+  - `utils-lisp-validate` — Validate code before commit
+  - `repl-eval` — Test code in REPL
+  - `repl-inspect` — Inspect variables/functions
+- [ ] **Never use edit tool on .lisp** — Only edit .org files; never touch generated .lisp directly
 - [ ] **One function per block** — Each `#+begin_src` block contains exactly one definition
 - [ ] **Prose before code** — Every block preceded by explanatory text
 - [ ] **Prose includes**: What the function does, arguments, return value, rationale
@@ -114,6 +122,8 @@ This agent MUST verify these conditions before, during, and after each task. Vio
 
 ### After Task (Validation)
 
+- [ ] **REPL verified** — Code tested in REPL before commit (not just text edit)
+- [ ] **Utils-lisp used** — Confirmed structural operations went through utils-lisp
 - [ ] **Tests pass** — Run full test suite; 100% pass required
 - [ ] **Chaos tier 1** — Deterministic regression tests pass
 - [ ] **No artifacts** — No orphaned `.bak`, `.log`, `.tmp`, or untracked test files