Require explicit --dev/--prd for Supabase scripts, block commits to main

[hiroshinishio]

Summary

• Supabase CLI scripts (query.sh, describe.sh, tables.sh, daily_cost_report.sh) now require explicit --dev or --prd flag instead of defaulting to dev -- prevents accidental production queries and accidental dev queries
• Pre-commit hook blocks commits directly to main branch
• Daily cost report restructured: PR-grouped summary first, then trigger/model breakdown, added PR count in totals
• CLAUDE.md updated to reflect new CLI usage and social post guidelines

Social Media Post (GitAuto)

Made Supabase CLI scripts safer

• Database scripts now require explicit --dev or --prd flag instead of silently defaulting to dev
• Pre-commit hook blocks direct commits to main branch
• Daily cost report now groups by PR first for faster scanning

Social Media Post (Wes)

Had a close call querying prod when I meant dev. The scripts defaulted to dev but I kept second-guessing which env I was hitting. Removed the default entirely. Now every query forces you to say --dev or --prd. Tiny friction, zero ambiguity.