test: add vanilla regression baselines

Capture rendered-text and visual baselines before route migration, and detect external CSS dependencies. Do not change verify.mjs assertions; task 02 must remove the known legacy font URL before the audit can pass.

.agents/snapshots/agents.txt

@@ -0,0 +1,40 @@
+AI For Dummies — Agents and trees
+← ROUTE MAP
+02 / AGENTS & TREES
+field guide ↗
+Subagent workflow
+One branch
+per
+hand.
+Agents work when roles, files, and evidence are bounded. A worktree gives each worker its own checkout while the orchestrator protects intent.
+The tree
+Split at
+the
+seam.
+MAIN / ORCHESTRATOR
+├── agent/ui → components + visual states · ├── agent/tests → acceptance + regressions · └── agent/docs → guide + examples · merge after each leaf returns a diff and evidence
+FRAME
+Orchestrator
+Owns scope, task graph, boundaries, and integration.
+HAND OFF
+Worker
+Owns one coherent slice and one worktree.
+PROVE
+Verifier
+Re-runs gates and reports remaining gaps.
+Handoff
+Context that
+can
+travel.
+01
+Brief
+Goal, owned files, dependencies, non-goals, acceptance.
+02
+Isolation
+One branch and worktree per independent change.
+03
+Evidence
+Commands, result, changed files, screenshots, gaps.
+Previous: models →
+Rules case study →
+Try the rules lab →