feat(web): classify tool evidence renderers

[seekskyworld]

Problem

Adds the renderer-input slice of #345. Tool results were rendered through one undifferentiated CSS/DOM path, making specialized file, diff, test, and terminal renderers difficult to add safely.

Value

The browser now receives stable semantic classes while preserving the existing bounded raw evidence fallback.

Approach

Classify known tool-name families into file, diff, test, terminal, or generic kinds at render time. No content inference, execution status inference, or raw evidence mutation is introduced.

Validation

• git diff --check

Impact

• User-visible behavior: no visual change unless a future stylesheet opts into the classes.
• Model-visible context/tools: none.
• Runtime/lifecycle: none.
• Persisted config/data: none.
• Compatibility/risk: unknown tools remain generic and safe.