docs: Add overlap analysis for non-AI coordinator patterns

Detailed comparison showing:
- Existing doc addresses L-015 (premature completion)
- New doc addresses context exhaustion (multi-issue orchestration)
- ~20% overlap (both use non-AI coordinator, mechanical gates)
- 80% complementary (different problems, different solutions)

Recommends merging into comprehensive document (already done).

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/token-budget/index.ts

@@ -0,0 +1,4 @@
+export * from "./token-budget.module";
+export * from "./token-budget.service";
+export * from "./interfaces";
+export * from "./dto";