fix(cli): reject partial numeric flag values

[EfeDurmaz16]

Summary

• validate decimal flags against the full input before converting
• reject partial numeric values like 1abc or 1.5s for temperature/duration-style flags
• add parser coverage for trailing non-numeric characters

Tests

• bun test packages/ai-cli/src/lib/parse.test.ts
• bun test
• bun run typecheck
• bun run format:check
• bun run lint (passes with existing warnings in unrelated files)
• bun run build

[vercel]

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