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/models.txt

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+AI For Dummies — Models
+← ROUTE MAP
+01 / MODELS
+field guide ↗
+Model routing
+Choose the
+engine.
+A model has a capability ceiling. Effort controls how much room it gets to reason. Route by uncertainty and verification cost.
+LOW
+Bounded rhythm
+Lookup, small edits, formatting, and transformations with clear checks.
+MEDIUM
+Default work
+Normal implementation where the contract is clear but context matters.
+HIGH
+Ambiguity
+Planning, architecture, security judgment, and hard failures.
+Two knobs
+Capability
+× effort
+ROUTING RULE
+strong model + high effort → frame ambiguity · light model + low effort → bounded execution · raise one knob at a time → compare evidence
+Sequence
+Spend judgment
+where it
+compounds.
+01
+Plan
+Strong model: scope, risks, acceptance, and worktree split.
+02
+Build
+Focused worker: smallest context and lightest model that can pass.
+03
+Review
+Independent pass when missed issues cost more than the call.
+Next: agents & trees →
+Rules case study →