Emphasize domain knowledge detail and tool orchestration in profiles

[tanglearncode]

Summary

Strengthens the Domain Profiles docs to make clear that detailed domain knowledge drives accurate model behavior, and that profiles should explicitly script tool usage.

• Adds framing: the more concrete your domain knowledge, the more accurately the model behaves — vague guidance yields improvised answers, specific knowledge yields repeatable ones.
• Adds a fourth "what good profiles are explicit about" item — Tool usage: which tools to call, in which situations, in what order, and when not to.
• Extends the example profile with explicit tool-calling investigation steps and a Tool Usage section.
• Reinforces the pointer to the demo project's profiles as realistic, tool-wired examples to copy.

Verification

• Admonition lint passes; npm run build succeeds.

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