Add SQL command

[coffeegoddd]

Summary

• add typed RunSQLRead and RunSQLWrite API v2 client methods
• add dh sql with positional, file, and stdin query input
• render dynamic read results in terminal tables or structured JSON
• add explicit asynchronous write mode with shared operation progress and --no-wait
• use --branch as the write target and default --from-branch to it for in-place writes
• update the Phase 6 tracking state and fully specify Phase 7

API operations

• runSqlReadQueryPost
• runSqlWriteQuery
• getOperation

Validation

• go test ./...
• go vet ./...
• golangci-lint run ./...
• git diff --check
• make build