fix(ask-user): keep question payloads compact

[jbetala7]

Fixes #1208.

Summary

• move the rich AskUserQuestion decision brief out of the tool question payload and into the preceding markdown
• require question to be one sentence, no newlines, <=80 chars
• limit one call to at most two related questions/tabs and avoid duplicated trade-off text
• regenerate tier-2+ skills and ship goldens

Testing

• bun test test/resolver-ask-user-format.test.ts test/gen-skill-docs.test.ts test/host-config.test.ts