Clarify Alexandria search workflow and simplify skill instructions

[developersdigest]

Updates the Alexandria skill to start from ordinary user questions with domain-tool discovery enabled. Documents the search → inspect contract → execute through Scrape flow, when to use Find Tools, and how source/domain flags affect results. Removes the trailing budget and terms-of-service instruction section.

Domain discovery is already enabled by default with the Alexandria source; this is a documentation-only change. Verified flag behavior against src/index.ts, checked Prettier formatting, and ran git diff --check.

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Summary by cubic

Rewrites the Alexandria skill to start from the user's ordinary question and documents the search → inspect contract → execute through Scrape flow. Removes the trailing budget-approval and terms-of-service section.

• Adds --domain-tools to the default search example and a reference table for source/domain flag combinations.
• Adds a numbered walkthrough covering web results, tool selection, find-tools fallback, and contract execution.

^{Written for commit 97b2332. Summary will update on new commits.}