docs: record Fiber v3 baseline

AGENTS.md

@@ -7,7 +7,7 @@ all claims with fresh commands.
 ## Project Overview
 
 micrach is a small, server-rendered, single-board imageboard. It uses Go,
-Fiber v2, Fiber HTML templates, PostgreSQL through `pgx`, and filesystem-backed
+Fiber v3, Fiber HTML templates, PostgreSQL through `pgx`, and filesystem-backed
 image uploads. It intentionally uses little browser-side JavaScript.
 
 The service supports thread creation, replies, JPEG/PNG attachments,
@@ -136,6 +136,11 @@ and prefer table-driven cases when practical. Repository tests must use
 disposable test data or a dedicated database, never a shared production
 database.
 
+Routine `go test ./...` must remain DB-free. Fiber handler and middleware tests
+must use in-memory apps and temporary directories; PostgreSQL-backed behavior
+belongs to the explicit manual smoke pass unless a later design approves an
+integration-test harness.
+
 Minimum verification for code changes:
 
 1. Run `go fmt ./...` and review the resulting diff.

README.md

@@ -22,7 +22,7 @@ provide; the source remains available for local use and development.
 ## Stack
 
 - Go 1.26
-- Fiber v2
+- Fiber v3
 - PostgreSQL 18 for local development
 - PostgreSQL access through [`pgx`](https://github.com/jackc/pgx)
 - Plain HTML templates and CSS

docs/superpowers/modernization-followups.md

@@ -0,0 +1,11 @@
+# Modernization Follow-ups
+
+Updated: 2026-07-16
+
+Wave 2 completed the confirmed Fiber v3 and template-engine major upgrades.
+The final direct-module, deprecated-API, `go vet`, and `govulncheck` audits found
+no remaining major-version or deprecated-API candidate requiring a scheduled
+follow-up.
+
+Recheck this file during the next deliberate dependency refresh. Do not add
+speculative architecture cleanup or ordinary patch/minor updates here.