docs(plan-9): doc-pass slice 1 — CLAUDE.md, core-shared AGENTS, architecture, plan-8 annotations

First slice of the combined Plan 8 + Plan 9 doc-update pass:
- CLAUDE.md Key Conventions: append schema-in-use-case, presenter,
  controller unknown input, feature-scoped tRPC error mapping, public
  surface split (./ui)
- packages/core-shared/AGENTS.md: document defineErrorMiddleware export
  + t re-export from trpc/init
- docs/superpowers/plans/2026-05-05-plan-8-*.md and matching spec:
  one-line note that some controller/router patterns shifted in Plan 9;
  link to the Plan 9 refactor log
- docs/architecture/overview.md: data-flow box now shows xProcedure +
  xInputSchema + xOutputSchema.parse + presenter + middleware lanes;
  three explanatory paragraphs added (schemas, presenter, error mapping)
- docs/architecture/dependency-flow.md: app-side ./ui subpath note,
  allowed/disallowed examples updated for Plan 9 paths

Remaining doc-pass items (root AGENTS.md, per-feature AGENTS.md ×5,
core-testing AGENTS.md, adding-a-feature.md, tdd-workflow.md,
testing-strategy.md, vertical-feature-spec.md) follow in subsequent
commits — to be dispatched in parallel.

docs/superpowers/specs/2026-05-05-lazar-pattern-conformance-design.md

@@ -1,5 +1,7 @@
 # Lazar Nikolov Clean Architecture Conformance — Design Spec
 
+> **Note (post-Plan-9, 2026-05-06):** §7 of this spec shows the controller's input schema as a local `const inputSchema = z.object(...)`. Plan 9 moved schemas to the use-case file (one source of truth, imported by controllers and tRPC routers) and added `function presenter` co-located with each non-void controller, plus per-feature `procedures.ts` for domain-error → `TRPCError` translation. See `docs/superpowers/refactor-logs/2026-05-06-input-output-unification.md` and ADR-013 for the post-Plan-9 layout.
+
 **Date:** 2026-05-05
 **Status:** Approved (autonomous execution authorized)
 **Author:** Claude Opus 4.7 (1M context)