feat(sdlc): add delegation model tier policy

Set modelProfile cheap only for mechanical, bounded tasks. Leave unset
(judgment/reasoning/QA) for standard tier. When in doubt, leave unset.

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

skills/sdlc/SKILL.md

@@ -6,7 +6,7 @@ description: >
   product analysis intake, PR review and merge policy, the handoff protocol,
   status semantics, infrastructure layout, the canonical tools list, the
   GitHub-origin issue board-approval gate, the cc-cpfarhood visibility rule,
-  and the scheduled penetration testing program.
+  the scheduled penetration testing program, and delegation model tier policy.
 ---
 
 # Software Development Lifecycle
@@ -124,6 +124,17 @@ gh pr create --base dev --title "..." --body "... cc @cpfarhood"
 
 > **Penetration testing.** Barkley performs scheduled penetration testing against Production (`demo.groombook.dev`) and Demo independently of the PR workflow. Board-authorized; not triggered per-PR. Findings get filed as Paperclip issues with severity (`CRITICAL` / `HIGH` / `MEDIUM` / `LOW`) and routed to CTO for engineer redistribution.
 
+## Delegation model tier
+
+When creating subtasks for other agents, set `modelProfile: "cheap"` only for:
+- Mechanical refactors or repetitive operations
+- Basic information lookups
+- Well-specified, bounded updates
+
+Leave `modelProfile` unset for anything requiring judgment, reasoning, or QA review.
+
+When in doubt, leave it unset.
+
 ## Handoff protocol — mandatory
 
 Every handoff to another agent requires ALL THREE steps: